Chakrabarti, Swapan Kumar, R. N. Yadav, and S. R. Pathak. “On Heyting Algebra”. International Journal For Research In Mathematics And Statistics 6, no. 5 (May 31, 2020): 01–05. Accessed May 11, 2024. https://gnpublication.org/index.php/ms/article/view/1314.