“A Modification of Bai Bithaman Ajil Instrument through Musharakah Mutanaqisah: Fixation of Robust Optimisation into Rule 78”. Global Journal of Science Frontier Research, vol. 14, no. F7, Jan. 2015, pp. 17-26, https://www.journalofscience.org/index.php/GJSFR/article/view/1436.