Sarma A, Smarandache F, Kroumov V. Neutrosophic Crisp Sets & Neutrosophic Crisp Topological Spaces. Neutrosophic Sets Syst. [Internet]. 2014 May 4 [cited 2025 Apr. 3];2:25-30. Available from: https://fs.unm.edu/nss8/index.php/111/article/view/206