1. Department of Mathematics, JECRC University, Jaipur 303905, Rajasthan, India
2. Department of Mathematics, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Korea
3. CITMAga, Departamento de Estadistica, Analise Matematica e Optimiizacion, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain