Wattanatripop, Khwancheewa, and Thodsaporn Kumduang. “The Partial Operation of Formulas With Applications to Formulas Generated by Order-Decreasing Mappings”. Thai Journal of Mathematics (September 29, 2023): 78–90. Accessed July 3, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/1473.