1. Department of Mathematics, Laboratoire de Mathæmatiques Nicolas Oresme, University of Caen, Caen 14032, France
2. Department of Mathematics, Faculty of Science, Tanta University, El Guish St., Tanta 31527, El Gharbeya, Egypt
3. Department of Mathematics, Institute of Infrastructure Technology, Research and Management (IITRAM), Maninagar East, Ahmedabad, Gujarat 380026, India (Corresponding author), e-mail: vikasstats@rediffmail.com, https://orcid.org/0000-0003-0169-4094