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"4-chromatic edge critical Grötzsch-Sachs graphs."
Andrey A. Dobrynin, Leonid S. Melnikov (2009)
- Andrey A. Dobrynin, Leonid S. Melnikov:
4-chromatic edge critical Grötzsch-Sachs graphs. Discret. Math. 309(8): 2564-2566 (2009)
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