Edge neighbourhood graphs
Bohdan Zelinka (1986)
Czechoslovak Mathematical Journal
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Bohdan Zelinka (1986)
Czechoslovak Mathematical Journal
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Ivan Havel (1968)
Časopis pro pěstování matematiky
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Bohdan Zelinka (1985)
Mathematica Slovaca
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Slobodan K. Simić (1982)
Publications de l'Institut Mathématique
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