J Alberto L López*, J Carrillo López, D E Vázquez Valerdi, G García Salgado, T Díaz-Becerril, A Ponce Pedraza and F J Flores Gracia
* Corresponding author: J Alberto L López jose.luna@correo.buap.mx
Nanoscale Research Letters 2012, 7:604 doi:10.1186/1556-276X-7-604