Bisgaard, Torben Maack
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MATHEMATICA SCANDINAVICA Vol. 65 (1989) - Articles
Characterization of perfect involution groups.
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MATHEMATICA SCANDINAVICA Vol. 89 No. 1 (2001) - Articles
Correction of an error in the paper "characterization of perfect involution groups"
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MATHEMATICA SCANDINAVICA Vol. 91 No. 1 (2002) - Articles
A reduction of the problem of characterizing perfect semigroups
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MATHEMATICA SCANDINAVICA Vol. 87 No. 2 (2000) - Articles
Bochner's theorem for semigroups: A counterexample
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MATHEMATICA SCANDINAVICA Vol. 91 No. 2 (2002) - Articles
Semiperfect finitely generated abelian semigroups without involution
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