Berhanu Assaye Alaba, Mihret Alamneh Taye, and Teferi Getachew Alemayehu. “$\delta$-Fuzzy Ideals in MS-Algebras”. International Journal of Mathematics And Its Applications, vol. 6, no. 2 - B, June 2018, pp. 273-80, https://ijmaa.in/index.php/ijmaa/article/view/725.