Team, Support. “Idempotent of Weak Projection Cohypersubstitutions: Nareupanat Lekkoksung, Prakit Jampachon, Somsak Lekkoksung”. Thai Journal of Mathematics (May 16, 2023): 59–74. Accessed May 20, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/757.