[1]School of Quantitative Sciences,Universiti Utara Malaysia,06010 Sintok,Kedah,Malaysia;
[1]School of Quantitative Sciences,Universiti Utara Malaysia,06010 Sintok,Kedah,Malaysia;
[2]Faculty of Mathematics and Statistics,Ton Duc Thang University,Ho Chi Minh City,Vietnam;
[1]School of Quantitative Sciences,Universiti Utara Malaysia,06010 Sintok,Kedah,Malaysia;