Khaldi, Khadidja, and Amina Hamdouni. “Islamic Financial Intermediation Compared to Ribaoui Financial Intermediation: A Theoretical and Mathematical Analysis”. International Journal of Economics and Financial Issues, vol. 8, no. 3, May 2018, pp. 268-83, https://econjournals.com/index.php/ijefi/article/view/6222.