One generalization of planar partitions of Abelian groups
Václav Havel (1966)
Commentationes Mathematicae Universitatis Carolinae
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One generalization of planar partitions of Abelian groups
Ternary halfgroupoids and coordinatization (Preliminary communication)
Václav Havel (1967)
Commentationes Mathematicae Universitatis Carolinae
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Construction of certain systems with two compositions
Václav Havel (1965)
Commentationes Mathematicae Universitatis Carolinae
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