Rédei László: The theory of finitely generated commutative semigroups (Budapest, 1965)
L. RÉDEI THEORY OF FINITELY GENERATED COMMUTATIVE SEMIGROUPS AKADÉMIAI KIADÓ PUBLISHING HOUSE OF THE HUNGARIAN ACADEMY OF SCIENCES BUDAPEST
L. RÉDEI THEORY OF FINITELY GENERATED COMMUTATIVE SEMIGROUPS AKADÉMIAI KIADÓ PUBLISHING HOUSE OF THE HUNGARIAN ACADEMY OF SCIENCES BUDAPEST