J O Estevez, Jesús Arriaga, Antonio Mendez-Blas, Edgar Reyes-Ayona, José Escorcia and Vivechana Agarwal*
* Corresponding author: Vivechana Agarwal vagarwal@uaem.mx
Nanoscale Research Letters 2012, 7:413 doi:10.1186/1556-276X-7-413