Laboratory of Theoretical Studies;
Institute of Mathematical Research;
University Putra Malaysia;
Serdang Selangor 43400;
Malaysia;
Malaysian Institute of Aviation Technology;
University Kuala Lumpur;
Dengkil Selangor 43800;
Malaysia;
Laboratory of Applied and Computational Statistics;
Institute of Mathematical Research;
University Putra Malaysia;
Serdang Selangor 43400;
Malaysia;