1. Faculty of Physics, National University of San Marcos, Av. Carlos German Amezaga 375, Cercado de Lima , Lima , Peru
2. Department of Science, Universidad de Ingenieria y Tecnologia - UTEC, Jr. Medrano Silva 165, Barranco , Lima , Peru
3. Postgraduate School, National University of Engineering, Av. Túpac Amaru 210, Rimac , Lima , Peru