4-chromatic edge critical Grötzsch-Sachs graphs. (English)
Discrete Math. 309, No. 8, 2564-2566 (2009).
1
Infinite families of 4-chromatic Grötzsch-Sachs graphs. (English)
J. Graph Theory 59, No. 4, 279-292 (2008).
2
Large faces in 4-critical planar graphs with minimum degree 4. (English)
Combinatorica 15, No.4, 455-467 (1995).
3
On 4-critical planar graphs with high edge density. (English)
Discrete Math. 98, No.2, 147-151 (1991).
4
The edge density of 4-critical planar graphs. (English)
Combinatorica 11, No.3, 185-189 (1991).
5
The edge-density of 4-critical planar graphs. (English)
Combinatorica 8, No.1, 137-139 (1988).
6
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