category c1 Refereed Journal Article, VU author signed VUIR permission pt.7/12/11. Not checked in SHERPA 5/7/12 HD. Pls see related URL for publication details "Joinly published by the Malaysian Mathematical Sciences Society and Universiti Sains Malaysia". While Ulrichsweb cites Malaysian Mathematical Society is the publisher. 5/7/12 HD. HERDC documentation added to dark upload - HD 6/7/20. -- Generic Permission Form added to Dark Archive 20.10.20-MMM.