[1] Prince Songkla Univ, Fac Environm Management, Environm Assessment & Technol Hazardous Waste Mana, Hat Yai, Thailand
[2] Hamdard Univ, Fac Management Sci, Islamabad, Pakistan
[3] Xiamen Univ, Sch Econ, Xiamen, Peoples R China
[4] Gongqing Inst Sci & Technol, Gongqing, Peoples R China
[5] Int Black Sea Univ, Fac Business & Technol, Tbilisi, Georgia