Songsaeng, M. ., K. . Ping Shum, R. . Chinram, and A. . Iampan. “Neutrosophic Implicative UP-Filters, Neutrosophic Comparative UP-Filters, and Neutrosophic Shift UP-Filters of UP-Algebras”. Neutrosophic Sets and Systems, vol. 47, Dec. 2021, pp. 620-43, http://fs.unm.edu/NSS2/index.php/111/article/view/2025.