Introducing an Orientation into a Given Non-Directed Graph
Bohdan Zelinka (1966)
Matematicko-fyzikálny časopis
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Bohdan Zelinka (1966)
Matematicko-fyzikálny časopis
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Anton Kotzig (1966)
Matematicko-fyzikálny časopis
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Marián Trenkler, Vladimír Vetchý (1997)
Mathematica Bohemica
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Necessary and sufficient conditions for a graph that its power , , is a magic graph and one consequence are given.