Kumar, Rakesh
Das, Subir
Article History
Received: 4 July 2018
Accepted: 9 May 2019
First Online: 18 May 2019
Compliance with ethical standards
:
: The authors Subir Das, Professor, Department of Mathematical Sciences, IIT (BHU), Varanasi, India, and Mr. Rakesh Kumar, who is pursuing his Ph.D. degree under the supervision of Prof. S. Das, declare that they have no conflict of interest.