Neighbourhood digraphs
Bohdan Zelinka (1987)
Archivum Mathematicum
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Bohdan Zelinka (1987)
Archivum Mathematicum
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Bohdan Zelinka (1991)
Archivum Mathematicum
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Ferdinand Gliviak (1976)
Mathematica Slovaca
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Dragoš M. Cvetković (1973)
Časopis pro pěstování matematiky
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Fischer, Eldar (1999)
The Electronic Journal of Combinatorics [electronic only]
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