Open Access Nano Express

Miniband-related 1.4–1.8 μm luminescence of Ge/Si quantum dot superlattices

VG Talalaev123*, GE Cirlin14, AA Tonkikh14, ND Zakharov1, P Werner1, U Gösele1, JW Tomm2 and T Elsaesser2

Author Affiliations

1 Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120, Halle/Saale, Germany

2 Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie, Max-Born-Strasse 2A, 12489, Berlin, Germany

3 V.A. Fock Institute of Physics, St. Petersburg State University, Ulyanovskaya 1, 198504 Petrodvorets, St. Petersburg, Russia

4 Ioffe Physico-Technical Institute RAS, 194021, Polytekhnicheskaya 26, St. Petersburg, Russia

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Nanoscale Research Letters 2006, 1:137-153  doi:10.1007/s11671-006-9004-x


The electronic version of this article is the complete one and can be found online at:


Published:1 August 2006

© 2006 to the authors

Abstract

The luminescence properties of highly strained, Sb-doped Ge/Si multi-layer heterostructures with incorporated Ge quantum dots (QDs) are studied. Calculations of the electronic band structure and luminescence measurements prove the existence of an electron miniband within the columns of the QDs. Miniband formation results in a conversion of the indirect to a quasi-direct excitons takes place. The optical transitions between electron states within the miniband and hole states within QDs are responsible for an intense luminescence in the 1.4–1.8 µm range, which is maintained up to room temperature. At 300 K, a light emitting diode based on such Ge/Si QD superlattices demonstrates an external quantum efficiency of 0.04% at a wavelength of 1.55 µm.

Keywords:
73.21.Cd; 73.21.La; 73.40.Gk; 73.63.Kv; 78.67.Hc; 78.67.Pt

Nano Express

[1-94]

Acknowledgments

We gratefully acknowledge helpful discussions with V. Kveder, D. Kovalev, G. Abstreiter and D. Grützmacher. We would like to thank A. Frommfeld for supporting the MBE growth and S. Schwirzke-Schaaf for contributions to Raman measurements. This work was supported by the EU project SANDiE (Network of Ecxellence, contract N. 500101). The Russian authors thank for support of the Russian Foundation of Basic Research (Grant N. 05-02-17780).

References

  1. Satpathy S, Martin RM, Van de Walle CG:

    Phys. Rev. B. 1988, 38:13237.

    COI number [1:CAS:528:DyaL1MXht1Wlurg%3D]

    Publisher Full Text OpenURL

  2. Turton RJ, Jaros M:

    Mat. Sci. Eng. B. 1990, 7:37. Publisher Full Text OpenURL

  3. Zachai R, Eberl K, Abstreiter G, Kasper E, Kibbel H:

    Phys. Rev. Lett.. 1990, 64:1055.

    COI number [1:CAS:528:DyaK3cXhsVyhtLw%3D]

    Publisher Full Text OpenURL

  4. Presting H, Kibbel H, Jaros M, Turton RM, Menczigar U, Abstreiter G, Grimmeiss HG:

    Semicond. Sci. Technol.. 1992, 7:1127.

    COI number [1:CAS:528:DyaK38XlvVSks7g%3D]

    Publisher Full Text OpenURL

  5. Ghosh S, Weber J, Presting H:

    Phys. Rev. B. 2000, 61:15625.

    COI number [1:CAS:528:DC%2BD3cXktV2murg%3D]

    Publisher Full Text OpenURL

  6. Fukatsu S, Akiyama H, Shiraki Y, Sakaki H:

    J. Cryst. Growth. 1995, 157:1.

    COI number [1:CAS:528:DyaK28XovFyjuw%3D%3D]

    Publisher Full Text OpenURL

  7. Dehlinger G, Diehl L, Gennser U, Sigg H, Faist J, Ensslin K, Grützmacher D, Müller E:

    Science. 2000, 290:2277.

    COI number [1:CAS:528:DC%2BD3cXptFSnurk%3D]

    Publisher Full Text OpenURL

  8. Sunamura H, Fukatsu S, Usami N, Shiraki Y:

    J. Cryst. Growth. 1995, 157:265.

    COI number [1:CAS:528:DyaK28XovFymtQ%3D%3D]

    Publisher Full Text OpenURL

  9. Eberl K, Schmidt OG, Duschl R, Kienzle O, Ernst E, Rau Y:

    Thin Solid Films. 2000, 369:33.

    COI number [1:CAS:528:DC%2BD3cXltVCqu7o%3D]

    Publisher Full Text OpenURL

  10. Brunhes T, Boucaud P, Sauvage S, Lourtioz J-M, Hernandez C, Campidelli Y, Kermarrec O, Bensahel D, Faini G, Sagnes I:

    Appl. Phys. Lett.. 2000, 77:1822.

    COI number [1:CAS:528:DC%2BD3cXmsV2qsb8%3D]

    Publisher Full Text OpenURL

  11. Vescan L, Chretien O, Stoica T, Mateeva E, Mück A:

    Mater. Sci. Semicond. Proc.. 2000, 3:383.

    COI number [1:CAS:528:DC%2BD3MXhsVyjs78%3D]

    Publisher Full Text OpenURL

  12. Stoffel M, Denker U, Schmidt OG:

    Appl. Phys. Lett.. 2003, 82:3236.

    COI number [1:CAS:528:DC%2BD3sXjs1Gks7k%3D]

    Publisher Full Text OpenURL

  13. Chang W-H, Chou AT, Chen WY, Chang HS, Hsu TM, Pei Z, Chen PS, Lee SW, Lai LS, Lu SC, Tsai M-J:

    Appl. Phys. Lett.. 2003, 83:2958.

    COI number [1:CAS:528:DC%2BD3sXnvVGntbw%3D]

    Publisher Full Text OpenURL

  14. Rieger MM, Vogl P:

    Phys. Rev. B. 1993, 48:14276.

    COI number [1:CAS:528:DyaK2cXos1ymtA%3D%3D]

    Publisher Full Text OpenURL

  15. Yakimov AI, Stepina NP, Dvurechenskii AV, Nikiforov AI, Nenashev AV:

    Semicond. Sci. Technol.. 2000, 15:1125.

    COI number [1:CAS:528:DC%2BD3MXot12q]

    Publisher Full Text OpenURL

  16. Tan PH, Bougeard D, Abstreiter G, Brunner K:

    Appl. Phys. Lett.. 2004, 84:2632.

    COI number [1:CAS:528:DC%2BD2cXivVaqtLo%3D]

    Publisher Full Text OpenURL

  17. Schorer R, Abstreiter G, de Gironcoli S, Molinari E, Kibbel H, Presting H:

    Phys. Rev. B. 1994, 49:5406.

    COI number [1:CAS:528:DyaK2cXisFKhtLc%3D]

    Publisher Full Text OpenURL

  18. Milekhin AG, Nikiforov AI, Pchelyakov OP, Schulze S, Zahn DRT:

    JETP Lett.. 2001, 73:461.

    COI number [1:CAS:528:DC%2BD3MXkslyntrs%3D]

    Publisher Full Text OpenURL

  19. Kwok SH, Yu PY, Tung CH, Zhang YH, Li MF, Peng CS, Zhou JM:

    Phys. Rev. B. 1999, 59:4980.

    COI number [1:CAS:528:DyaK1MXhtVKnt7k%3D]

    Publisher Full Text OpenURL

  20. Liu JL, Jin G, Tang YS, Luo YH, Wang KL:

    Appl. Phys. Lett.. 2000, 76:586.

    COI number [1:CAS:528:DC%2BD3cXnsVaktA%3D%3D]

    Publisher Full Text OpenURL

  21. Alonso VI, Winer K:

    Phys. Rev. B. 1989, 39:10056.

    COI number [1:CAS:528:DyaL1MXks1Krtb8%3D]

    Publisher Full Text OpenURL

  22. Schröter W, Cerva H:

    Solid State Phenom.. 2002, 85–86:67. OpenURL

  23. Kveder VV, Steinman EA, Shevchenko SA, Grimmeiss HG:

    Phys. Rev. B. 1995, 51:10520.

    COI number [1:CAS:528:DyaK2MXlsVSgt7o%3D]

    Publisher Full Text OpenURL

  24. Zakharov ND, Talalaev VG, Werner P, Tonkikh AA, Cirlin GE:

    Appl. Phys. Lett.. 2003, 83:3084.

    COI number [1:CAS:528:DC%2BD3sXotVartbo%3D]

    Publisher Full Text OpenURL

  25. Chang W-H, Chen W-Y, Chou A-T, Hsu T-M, Chen P-S, Pei Z, Lai L-S:

    J. Appl. Phys.. 2003, 93:4999.

    COI number [1:CAS:528:DC%2BD3sXjtVyjs7k%3D]

    Publisher Full Text OpenURL

  26. Fukatsu S, Sunamura H, Shiraki Y, Komiyama S:

    Appl. Phys. Lett.. 1997, 71:258.

    COI number [1:CAS:528:DyaK2sXksFOlu78%3D]

    Publisher Full Text OpenURL

  27. Schittenhelm P, Engel C, Findeis F, Abstreiter G, Darhuber AA, Bauer G, Kosogov AO, Werner P:

    J. Vac. Sci. Technol. B. 1998, 16:1575.

    COI number [1:CAS:528:DyaK1cXjsFKlu7w%3D]

    Publisher Full Text OpenURL

  28. Schmidt OG, Kienzle O, Hao Y, Eberl K, Ernst F:

    Appl. Phys. Lett.. 1999, 74:1272.

    COI number [1:CAS:528:DyaK1MXhtlektrw%3D]

    Publisher Full Text OpenURL

  29. Vescan L:

    Mater. Sci. Eng. A. 2001, 302:6. Publisher Full Text OpenURL

  30. Loo R, Meunier-Beillard P, Vanhaeren D, Bender H, Caymax M, Vandervorst W, Dentel D, Goryll M, Vescan L:

    J. Appl. Phys.. 2001, 90:2565.

    COI number [1:CAS:528:DC%2BD3MXmt1Wrsb8%3D]

    Publisher Full Text OpenURL

  31. Novikov AV, Lobanov DN, Yablonsky AN, Drozdov YN, Vostokov NV, Krasilnik ZF:

    Physica E. 2003, 16:467.

    COI number [1:CAS:528:DC%2BD3sXhs1egs70%3D]

    Publisher Full Text OpenURL

  32. Lubyshev DI, González-Borrero PP, Marega E, Petitprez E, La Scala N, Basmaji P:

    Appl. Phys. Lett.. 1996, 68:205.

    COI number [1:CAS:528:DyaK28XivVGmsg%3D%3D]

    Publisher Full Text OpenURL

  33. Lobo C, Leon R, Marcinkevicius S, Yang W, Sercel PC, Liao XZ, Zou J, Cockayne DJH:

    Phys. Rev. B. 1999, 60:16647.

    COI number [1:CAS:528:DC%2BD3cXislKhtg%3D%3D]

    Publisher Full Text OpenURL

  34. Talalaev VG, Novikov BV, Smirnov MA, Kachkanov VV, Gobsch G, Goldhahn R, Winzer A, Cirlin GE, Egorov VA, Ustinov VM:

    Nanotechnology. 2002, 13:143.

    COI number [1:CAS:528:DC%2BD38XktlGltLk%3D]

    Publisher Full Text OpenURL

  35. Dvurechenskii AV, Yakimov AI:

    Semiconductors. 2001, 35:1143.

    COI number [1:CAS:528:DC%2BD3MXmsFalu7w%3D]

    Publisher Full Text OpenURL

  36. Wan J, Luo YH, Jiang ZM, Jin G, Liu JL, Wang KL, Liao XZ, Zou J:

    Appl. Phys. Lett.. 2001, 79:1980.

    COI number [1:CAS:528:DC%2BD3MXntVWitbY%3D]

    Publisher Full Text OpenURL

  37. Kveder VV, Steinman EA, Shevchenko SA, Grimmeiss HG:

    Phys. Rev. B. 1995, 51:10520.

    COI number [1:CAS:528:DyaK2MXlsVSgt7o%3D]

    Publisher Full Text OpenURL

  38. Schröter W, Cerva H:

    Solid State Phenom.. 2002, 85–86:67. Publisher Full Text OpenURL

  39. Cirlin GE, Talalaev VG, Zakharov ND, Egorov VA, Werner P: .

    Phys. Stat. Sol. (b) 2002, 232:R1.

    COI number [1:CAS:528:DC%2BD38Xls1OisLo%3D]

    Publisher Full Text OpenURL

  40. Talalaev VG, Cirlin GE, Tonkikh AA, Zakharov ND, Werner P: .

    Phys. Stat. Sol. (a) 2003, 198:R4.

    COI number [1:CAS:528:DC%2BD3sXmtlymtrk%3D]

    Publisher Full Text OpenURL

  41. Vescan L, Stoica T, Chretien O, Goryll M, Mateeva E, Mück A:

    J. Appl. Phys.. 2000, 87:7275.

    COI number [1:CAS:528:DC%2BD3cXivVOjsbo%3D]

    Publisher Full Text OpenURL

  42. Ong TC, Terrill KW, Tam S, Hu C:

    IEEE Elec. Dev. Lett.. 1983, 4:460. OpenURL

  43. Sveinbjörnsson EÖ, Weber J:

    Appl. Phys. Lett.. 1996, 69:2686. Publisher Full Text OpenURL

  44. Kveder V, Badylevich M, Steinman E, Izotov A, Seibt M, Schröter W:

    Appl. Phys. Lett.. 2004, 84:2106.

    COI number [1:CAS:528:DC%2BD2cXitlKktbY%3D]

    Publisher Full Text OpenURL

  45. Peng CS, Huang Q, Cheng WQ, Zhou JM, Zhang YH, Sheng TT, Tung CH:

    Appl. Phys. Lett.. 1998, 72:2541.

    COI number [1:CAS:528:DyaK1cXislyru70%3D]

    Publisher Full Text OpenURL

  46. Engvall J, Olajos J, Grimmeiss HG, Presting H, Kibbel H, Kasper E:

    Appl. Phys. Lett.. 1993, 63:491.

    COI number [1:CAS:528:DyaK3sXls12ls7o%3D]

    Publisher Full Text OpenURL

  47. Presting H, Zinke T, Brux O, Gail M, Abstreiter G, Kibbel H, Jaros M:

    J. Cryst. Growth. 1995, 157:15.

    COI number [1:CAS:528:DyaK28XovFyisw%3D%3D]

    Publisher Full Text OpenURL

  48. Kasper E:

    Surf. Sci.. 1986, 174:630.

    COI number [1:CAS:528:DyaL28Xls1ansrw%3D]

    Publisher Full Text OpenURL

  49. Tonkikh AA, Talalaev VG, Zakharov ND, Cirlin GE, Ustinov VM, Werner P:

    Tech. Phys. Lett.. 2003, 29:739.

    COI number [1:CAS:528:DC%2BD3sXnsVWmtb4%3D]

    Publisher Full Text OpenURL

  50. Scmidt OG, Eberl K, Rau Y:

    Phys. Rev. B. 2000, 62:16715. Publisher Full Text OpenURL

  51. Egorov VA, Cirlin GE, Tonkikh AA, Talalaev VG, Makarov AG, Ledentsov NN, Ustinov VM, Zakharov ND, Werner P:

    Phys. Solid State. 2004, 46:49.

    COI number [1:CAS:528:DC%2BD2cXitlOrsA%3D%3D]

    Publisher Full Text OpenURL

  52. Cirlin GE, Tonkikh AA, Ptitsyn VE, Dubrovskii VG, Masalov SA, Evtikhiev VP, Denisov DV, Ustinov VM, Werner P:

    Phys. Solid State. 2005, 47:58.

    COI number [1:CAS:528:DC%2BD2MXhsVyls7s%3D]

    Publisher Full Text OpenURL

  53. Guffarth F, Heitz R, Schliwa A, Pötschke K, Bimberg D:

    Physica E. 2004, 21:326.

    COI number [1:CAS:528:DC%2BD2cXitlKjs7g%3D]

    Publisher Full Text OpenURL

  54. Grahn H.T. (Ed): Semiconductor Superlattices, Growth and Electronic Properties. World Scientific, Singapore; 1995. OpenURL

  55. Sibille A, Minot C, Laruelle F:

    Int. J. Mod. Phys. B. 2000, 14:909.

    COI number [1:CAS:528:DC%2BD3cXlsleiu7w%3D]

    OpenURL

  56. Wacker A:

    Phys. Rep.. 2002, 357:1.

    COI number [1:CAS:528:DC%2BD3MXosFGgsb4%3D]

    Publisher Full Text OpenURL

  57. Esaki L, Tsu R:

    IBM J. Res. Dev.. 1970, 14:61.

    COI number [1:CAS:528:DyaE3cXnt1aitw%3D%3D]

    Publisher Full Text OpenURL

  58. Kazarinov RF, Suris RA:

    Semiconductors. 1972, 6:120. OpenURL

  59. Tsu R, Esaki L:

    Appl. Phys. Lett.. 1973, 22:562.

    COI number [1:CAS:528:DyaE3sXltF2nu7o%3D]

    Publisher Full Text OpenURL

  60. Tsu R, Döhler G:

    Phys. Rev. B. 1975, 12:680. Publisher Full Text OpenURL

  61. Chang LL, Esaki L, Tsu R:

    Appl. Phys. Lett.. 1974, 24:593.

    COI number [1:CAS:528:DyaE2cXksVaqtrw%3D]

    Publisher Full Text OpenURL

  62. Esaki L, Chang LL:

    Phys. Rev. Lett.. 1974, 33:495.

    COI number [1:CAS:528:DyaE2cXlsValsbs%3D]

    Publisher Full Text OpenURL

  63. Colocci M, Vinattieri A, Lippi L, Bogani F, Rosa-Clot M, Taddei S, Bosacchi A, Franchi S, Frigeri P:

    Appl. Phys. Lett.. 1999, 74:564.

    COI number [1:CAS:528:DyaK1MXltlGjtQ%3D%3D]

    Publisher Full Text OpenURL

  64. Solomon GS, Trezza JA, Marshall AF, Harris JS:

    Phys. Rev. Lett.. 1996, 76:952.

    COI number [1:CAS:528:DyaK28Xotl2htw%3D%3D]

    Publisher Full Text OpenURL

  65. Ilahi B, Sfaxi L, Hassen F, Bouzaiene L, Maaref H, Salem B, Bremond G, Marty O:

    Phys. Stat. Sol. (a). 2003, 199:457.

    COI number [1:CAS:528:DC%2BD3sXovFCnsbc%3D]

    Publisher Full Text OpenURL

  66. Liu BL, Xu ZY, Liu HY, Wang ZG:

    J. Cryst. Growth. 2000, 220:51.

    COI number [1:CAS:528:DC%2BD3cXnvVCltb8%3D]

    Publisher Full Text OpenURL

  67. Lan S, Akahane K, Jang K-Y, Kawamura T, Okada Y, Kawabe M, Nishimura T, Wada O:

    Jpn. J. Appl. Phys.. 1999, 38:2934.

    COI number [1:CAS:528:DyaK1MXjs12qsbs%3D]

    Publisher Full Text OpenURL

  68. Song HZ, Akahane K, Lan S, Xu HZ, Okada Y, Kawabe M:

    Phys. Rev. B. 2001, 64:085303.

    COI number [1:CAS:528:DC%2BD3MXlvVegur0%3D]

    Publisher Full Text OpenURL

  69. Lazarenkova OL, Balandin AA:

    J. Appl. Phys.. 2001, 89:5509.

    COI number [1:CAS:528:DC%2BD3MXjt1eiurg%3D]

    Publisher Full Text OpenURL

  70. Bao Y, Balandin AA, Liu JL, Liu J, Xie YH:

    Appl. Phys. Lett.. 2004, 84:3355.

    COI number [1:CAS:528:DC%2BD2cXjsVKlsbc%3D]

    Publisher Full Text OpenURL

  71. Perales Á, Bonilla LL, Escobedo R:

    Nanotechnology. 2004, 15:S229.

    COI number [1:CAS:528:DC%2BD2cXmtlGkurk%3D]

    Publisher Full Text OpenURL

  72. Kawashima K, Takata M, Fujiwara K, Kagawa T, Tadanaga O, Iwamura H:

    Microelectron. Eng.. 2000, 51–52:143. Publisher Full Text OpenURL

  73. Shimada Y, Sekine N, Hirakawa K:

    Physica E. 2004, 21:661.

    COI number [1:CAS:528:DC%2BD2cXitlKjtbY%3D]

    Publisher Full Text OpenURL

  74. Takagahara T:

    Surf. Sci.. 1992, 267:310.

    COI number [1:CAS:528:DyaK38XisVCksrw%3D]

    Publisher Full Text OpenURL

  75. Grundmann M, Stier O, Bimberg D:

    Phys. Rev. B. 1995, 52:11969.

    COI number [1:CAS:528:DyaK2MXptVSqtr0%3D]

    Publisher Full Text OpenURL

  76. Wan J, Jin GL, Jiang ZM, Luo YH, Liu JL, Wang KL:

    Appl. Phys. Lett.. 2001, 78:1763.

    COI number [1:CAS:528:DC%2BD3MXhvVyltbw%3D]

    Publisher Full Text OpenURL

  77. Bremond G, Serpentini M, Souifi A, Guillot G, Jacquier B, Abdallah M, Berbezier I, Joyce B:

    Microelectron. J.. 1999, 30:357.

    COI number [1:CAS:528:DyaK1MXjtFyqsL4%3D]

    Publisher Full Text OpenURL

  78. Heitz R, Ledentsov NN, Bimberg D, Egorov AY, Maximov MV, Ustinov VM, Zhukov AE, Alferov ZhI, Cirlin GE, Soshnikov IP, Zakharov ND, Werner P, Gösele U:

    Appl. Phys. Lett.. 1999, 74:1701.

    COI number [1:CAS:528:DyaK1MXhvV2ntL0%3D]

    Publisher Full Text OpenURL

  79. Lenchyshyn LC, Thewalt MLW, Sturm JC, Xiao X:

    Phys. Rev. B. 1993, 47:16659.

    COI number [1:CAS:528:DyaK3sXkvVansLc%3D]

    Publisher Full Text OpenURL

  80. Leo K, Shah J, Göbel EO, Gordon JP, Schmitt-Rink S:

    Semicond. Sci. Technol.. 1992, 7:B394.

    COI number [1:CAS:528:DyaK38XitVGmsLk%3D]

    Publisher Full Text OpenURL

  81. Haacke S, Pelekanos NT, Mariette H, Zigone M, Heberle AP, Rühle WW:

    Phys. Rev. B. 1993, 47:16643.

    COI number [1:CAS:528:DyaK3sXkvVansLk%3D]

    Publisher Full Text OpenURL

  82. Mendez EE, Agulló-Rueda F, Hong JM:

    Phys. Rev. Lett.. 1988, 60:2426.

    COI number [1:CAS:528:DyaL1cXkt12ntrg%3D]

    Publisher Full Text OpenURL

  83. Agulló-Rueda F, Mendez EE, Hong JM:

    Phys. Rev. B. 1989, 40:1357. Publisher Full Text OpenURL

  84. Bleuse J, Bastard G, Voisin P:

    Phys. Rev. Lett.. 1988, 60:220.

    COI number [1:CAS:528:DyaL1cXosVCmtg%3D%3D]

    Publisher Full Text OpenURL

  85. Yakimov AI, Adkins CJ, Boucher R, Dvurechenskii AV, Nikiforov AI, Pchelyakov OP, Biskupski G:

    Phys. Rev. B. 1999, 59:12598.

    COI number [1:CAS:528:DyaK1MXjtVeltb0%3D]

    Publisher Full Text OpenURL

  86. Yakimov AI, Dvurechenskii AV, Nikiforov AI, Adkins CJ:

    Phys. Stat. Sol. (b). 2000, 218:99.

    COI number [1:CAS:528:DC%2BD3cXitFWksL8%3D]

    Publisher Full Text OpenURL

  87. Rauch C, Strasser G, Unterrainer K, Boxleitner W, Gornik E, Wacker A:

    Phys. Rev. Lett.. 1998, 81:3495.

    COI number [1:CAS:528:DyaK1cXmvVCisLg%3D]

    Publisher Full Text OpenURL

  88. Sibille A, Palmier JF, Hadjazi M, Wang H, Etemadi G, Dutisseuil E, Mollot F:

    Superlatt. Microstruct.. 1993, 13:247.

    COI number [1:CAS:528:DyaK2cXkt12ksQ%3D%3D]

    Publisher Full Text OpenURL

  89. Larsson M, Elfving A, Holtz P-O, Hansson GV, Ni W-X:

    Physica E.. 2003, 16:476.

    COI number [1:CAS:528:DC%2BD3sXhs1egs7s%3D]

    Publisher Full Text OpenURL