[Jin, Fang] Hunan City Univ, Coll Sci, Yiyang 413000, Peoples R China.
[Qian, Zi-Shan] Univ Calif Irvine, Sch Phys Sci, Irvine, CA 92617 USA.
[Chu, Yu-Ming] Huzhou Univ, Dept Math, Huzhou 313000, Peoples R China.
[Chu, Yu-Ming] Hangzhou Normal Univ, Inst Adv Study Honoring Chen Jian Gong, Hangzhou 311121, Peoples R China.
[Rahman, Mati Ur] Shanghai Jiao Tong Univ, Sch Math Sci, Shanghai, Peoples R China.