Puspita NP, Wijayanti IE, Surodjo B. The Necessary and Sufficient Condition of Clean R-Coalgebra e⇀C↼e. JIMS [Internet]. 2022 Jul. 31 [cited 2024 May 3];28(2):215-20. Available from: http://jims-a.org/index.php/jimsa/article/view/1066