[Li, Yun-Xiang] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.
[Mishra, S. R.] Siksha O Anusandhan Deemed Univ, Dept Math, Khandagiri Sq, Bhubaneswar 751030, Odisha, India.
[Pattnaik, P. K.] Coll Engn Technol, Dept Math, Bhubaneswar, India.
[Baag, S.] OUAT, Dept Phys, Coll Basic Sci & Humanities, Bhubaneswar, Odisha, India.
[Li, Yong-Min] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.