Leeratanavalee, Sorasak, and Jukkrit Daengsaen. 2022. “Green’s Relations on Regular Elements of Semigroup of Relational Hypersubstitutions for Algebraic Systems of Type ((m), (n))”. Tamkang Journal of Mathematics 53 (2):127-46. https://doi.org/10.5556/j.tkjm.53.2022.3436.