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Samruam Baupradist. 1999. Semigroups whose bi-ideals are quasi-ideals. Field of Study Mathematics, Chulalongkorn University;
Samruam Baupradist. (1999) Semigroups whose bi-ideals are quasi-ideals . Chulalongkorn University/Bangkok.
Samruam Baupradist. Semigroups whose bi-ideals are quasi-ideals. . Bangkok:Chulalongkorn University, 1999.
Samruam Baupradist. (1999) Semigroups whose bi-ideals are quasi-ideals . Chulalongkorn University/Bangkok.