selected publications academic article Confidence Interval for Parameters Estimates in Circular Simultaneous Functional Relationship Model (CSFRM) for Equal Variances using Normal Asymptotic and Bootstrap Confidence Intervals. Sains Malaysiana. 51:3819-3827. 2021 conference paper A computational study of lower bounds for the economic lot-sizing with remanufacturing and joint setups. AIP Conference Proceedings. 040002. 2019