Department of Mathematics;
Faculty of Science;
Universiti Putra Malaysia;
Serdang;
Selangor;
Malaysia;
Faculty of Sciences & Technology;
Universiti Malaysia Pahang;
Gambang;
Kuantan;
Malaysia;
Laboratory of Computational Statistics and Operations Research;
Institute for Mathematical Research;
Universiti Putra Malaysia;
Serdang;
Selangor;
Malaysia;
Reverse; Logistics; Supply; Chain; Strategic; Tactical; Operational;