4-critical 4-valent planar graphs constructed with crowns.
G. Koester (1990)
Mathematica Scandinavica
Similarity:
G. Koester (1990)
Mathematica Scandinavica
Similarity:
Gabriel Dirac (1972)
Mathematica Scandinavica
Similarity:
Lars Dovling Andersen (1977)
Mathematica Scandinavica
Similarity:
Ivan Tafteberg Jakobsen (1972)
Mathematica Scandinavica
Similarity:
Helge Tverberg (1976)
Mathematica Scandinavica
Similarity:
JONAS EKMAN FJELDSTAD (1954)
Mathematica Scandinavica
Similarity:
H.W. Gould (1958)
Mathematica Scandinavica
Similarity:
H.W. Gould (1961)
Mathematica Scandinavica
Similarity:
H.W. Gould (1960)
Mathematica Scandinavica
Similarity:
Olli LEHTO (1953)
Mathematica Scandinavica
Similarity:
R. Kaufman (1974)
Mathematica Scandinavica
Similarity:
Maria Aparecida Soares Ruas (1986)
Mathematica Scandinavica
Similarity:
R.M. Brooks (1972)
Mathematica Scandinavica
Similarity:
Flemming Topsoe (1976)
Mathematica Scandinavica
Similarity: