Takaaki Fujita, and Florentin Smarandache. “ Neutrosophic Circular-Arc Graphs and Proper Circular-Arc Graphs”. Neutrosophic Sets and Systems 78 (January 1, 2025): 1–30. Accessed April 17, 2025. https://fs.unm.edu/nss8/index.php/111/article/view/5444.