Affiliation: | (1) Department of Physics, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Mexico D.F., 09340, Mexico;(2) Departments of Mathematics, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Mexico D.F., 09340, Mexico |