Varieties of Lattice-Ordered Groups.
Jorge Martinez (1974)
Mathematische Zeitschrift
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Jorge Martinez (1974)
Mathematische Zeitschrift
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Marra, Vincenzo, Mundici, Daniele (2002)
Séminaire Lotharingien de Combinatoire [electronic only]
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Jiří Rachůnek (1995)
Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
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N.Ya. Medvedev, S. V. Morozova (1998)
Czechoslovak Mathematical Journal
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N.Ya. Medvedev (1992)
Czechoslovak Mathematical Journal
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Alfonz Haviar, Gabriela Monoszová (2001)
Discussiones Mathematicae Graph Theory
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In this paper we investigate varieties of orgraphs (that is, oriented graphs) as classes of orgraphs closed under isomorphic images, suborgraph identifications and induced suborgraphs, and we study the lattice of varieties of tournament-free orgraphs.