Kanika Rana, Department of Mathematics, Chandigarh University, Gharuan, Mohali, Punjab, India.
Madhavan Namboothiri N M, Government Arts & Science College, Santhanpara, Idukki, Kerala, India, 685 619
Mohammad Imdad, Department of Mathematics, Aligarh Muslim University, Aligarh, India.
Muzibur Rahman Mozumder, Faculty of Science, Department of Mathematics, Aligarh Muslim University, Aligarh-202002, India
P. S. Srinivasan, Department of Mathematics, Bharathidasan University, Tiruchirappalli-620 024, Tamilnadu, India
Surjeet Singh Chauhan(Gonder), Department of Mathematics, Chandigarh University, Gharuan, Mohali, Punjab, India