Qr-semigroups
Stojan Bogdanović (1981)
Publications de l'Institut Mathématique
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Stojan Bogdanović (1981)
Publications de l'Institut Mathématique
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Jill A. Dumesnil (1997)
Czechoslovak Mathematical Journal
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F. Masat (1978)
Fundamenta Mathematicae
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Pavel Goralčík, Václav Koubek (1984)
Mathematica Slovaca
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A. Anjaneyulu (1980)
Czechoslovak Mathematical Journal
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