Team S. Green’s Relations and Natural Partial Order on the Regular Subsemigroup of Transformations Preserving an Equivalence Relation and Fixed a Cross-Section: Nares Sawatraksa, Chaiwat Namnak, Kritsada Sangkhanan. Thai J Math [Internet]. 2019 Aug. 1 [cited 2024 May 8];17(2):431-44. Available from: https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/902