1. Department of Mathematical Sciences, P. D. Patel Institute of Applied Sciences Charotar University of Science and Technology (CHARUSAT) Changa Anand 388421 Gujarat India
2. CONACyT‐Tecnológico Nacional de México/CENIDET Interior Internado Palmira S/N Col. Palmira, C.P. 62490 Cuernavaca Morelos México