Erki Kärber, Taavi Raadik, Tatjana Dedova, Jüri Krustok, Arvo Mere, Valdek Mikli and Malle Krunks*
* Corresponding author: Malle Krunks malle@staff.ttu.ee
Nanoscale Research Letters 2011, 6:359 doi:10.1186/1556-276X-6-359