1. Department of Mathematical Sciences , Baba Ghulam Shah Badshah University , Rajouri , Jammu and Kashmir, 185234 , India
2. Department of Mathematics , Indira Gandhi National Tribal University , Lalpur , Amarkantak , Anuppur, Madhya Pradesh 484-887 , India
3. Department of Mathematics , Aligarh Muslim University , Aligarh 202002 , India
4. Department of Mathematics , Indira Gandhi National Tribal University , Ward No.-16, Bhagatbandh , Anuppur , Madhya Pradesh 484-224 , India