Bhimraj Basumatary, and Jili Basumatary. “Number of Neutrosophic Topological Spaces on Finite Set With K ≤ 4 Open Sets”. Neutrosophic Sets and Systems, vol. 53, Jan. 2023, pp. 508-1, https://fs.unm.edu/nss8/index.php/111/article/view/3241.