On signed degrees in signed graphs
Gary Chartrand, Heather Gavlas, Frank Harary, Michelle Schultz (1994)
Czechoslovak Mathematical Journal
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Gary Chartrand, Heather Gavlas, Frank Harary, Michelle Schultz (1994)
Czechoslovak Mathematical Journal
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Anton Kotzig, Bohdan Zelinka (1970)
Matematický časopis
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Mathematica Slovaca
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International Journal of Mathematics and Mathematical Sciences
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