Berhanu Assaye Alaba, and Derebew Nigussie Derso. “Quotient Heyting Algebras Via Fuzzy Congruence Relations”. International Journal of Mathematics And its Applications 5, no. 2 - C (June 15, 2017): 371–378. Accessed July 3, 2024. https://ijmaa.in/index.php/ijmaa/article/view/830.