4-critical 4-valent planar graphs constructed with crowns.
Mathematica Scandinavica, Tome 67 (1990) no. 2, pp. 15-22
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@article{MS2_1990__67_2_167117,
author = {G. Koester},
title = {4-critical 4-valent planar graphs constructed with crowns.},
journal = {Mathematica Scandinavica},
pages = {15--22},
publisher = {mathdoc},
volume = {67},
number = {2},
year = {1990},
zbl = {0723.05056},
url = {http://geodesic.mathdoc.fr/item/MS2_1990__67_2_167117/}
}
G. Koester. 4-critical 4-valent planar graphs constructed with crowns.. Mathematica Scandinavica, Tome 67 (1990) no. 2, pp. 15-22. http://geodesic.mathdoc.fr/item/MS2_1990__67_2_167117/