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"Grötzsch's 3-Color Theorem and Its Counterparts for the Torus and the ..."
Carsten Thomassen (1994)
- Carsten Thomassen:
Grötzsch's 3-Color Theorem and Its Counterparts for the Torus and the Projective Plane. J. Comb. Theory, Ser. B 62(2): 268-279 (1994)
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