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Chingchai Wathanathammetee. 1991. Almost multiplicatively cancellative seminear-rings and skew rings of right(left) differences of semirings. Bangkok:Chulalongkorn University;
Chingchai Wathanathammetee. (1991) Almost multiplicatively cancellative seminear-rings and skew rings of right(left) differences of semirings (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.
Chingchai Wathanathammetee. Almost multiplicatively cancellative seminear-rings and skew rings of right(left) differences of semirings. Bangkok:Chulalongkorn University, 1991.
Chingchai Wathanathammetee. (1991) Almost multiplicatively cancellative seminear-rings and skew rings of right(left) differences of semirings (รายงานผลงานวิจัย). Chulalongkorn University:Bangkok.