Keyword: cooperation
Rafaquat Ali, Khalid Khurshid, Abid Shahzad, Irshad Hussain, Zainudin Abu Bakar
EURASIA J Math Sci Tech Ed, Volume 14, Issue 4, pp. 1175-1187
Xian Liu, Jianqiang Guo, Qiner Xu, Lunhong Dong
EURASIA J Math Sci Tech Ed, Volume 13, Issue 8, pp. 5775-5783