A. A. Salama, Florentin Smarandache, and S. A. Alblowi. “New Neutrosophic Crisp Topological Concepts ”. Neutrosophic Sets and Systems 4 (June 25, 2014): 50–54. Accessed January 25, 2026. https://fs.unm.edu/nss8/index.php/111/article/view/3916.