Jose Martin Herrera Ramirez is a researcher at the Advanced Materials Research Center (CIMAV), Mexico.
Raul Perez Bustamante is a researcher at CONACYT – The Mexican Corporation for Research on Materials (COMIMSA), Mexico.
Cesar Augusto Isaza Merino is a researcher at the Pascual Bravo University Institute, Colombia.
Ana Maria Arizmendi Morquecho is a researcher at the Advanced Materials Research Center (CIMAV), Mexico.