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Nongnuch Nivasanon. 1987. Regular matrix semigroups over semirings. Graduate School, Chulalongkorn University;
Nongnuch Nivasanon. (1987) Regular matrix semigroups over semirings . Chulalongkorn University/Bangkok.
Nongnuch Nivasanon. Regular matrix semigroups over semirings. . Bangkok:Chulalongkorn University, 1987.
Nongnuch Nivasanon. (1987) Regular matrix semigroups over semirings . Chulalongkorn University/Bangkok.