Madad Khan, Florentin Smarandache, and Sania Afzal. “Neutrosophic Set Approach for Characterizations of Left Almost Semigroups”. Neutrosophic Sets and Systems 11 (May 4, 2016): 79–94. Accessed July 16, 2024. https://fs.unm.edu/nss8/index.php/111/article/view/523.