P. Jeyanthi

Department of Mathematics, Govindammal Aditanar College for Women, Tiruchendur, Tamil Nadu, India

G. Hemalatha

Department of mathematics, Shri Andal Alagar College of Engineering, Mamandur, Kancheepuram, Tamil Nadu, India

B. Davvaz

Department of Mathematics, Yazd University, Yazd, Iran