Geodesic
On a four-colour theorem.
Mathematica Scandinavica, Tome 39 (1976), pp. 267-270.

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     author = {Helge Tverberg},
     title = {On a four-colour theorem.},
     journal = {Mathematica Scandinavica},
     pages = {267--270},
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     volume = {39},
     year = {1976},
     zbl = {0347.05104},
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Helge Tverberg. On a four-colour theorem.. Mathematica Scandinavica, Tome 39 (1976), pp. 267-270. http://geodesic.mathdoc.fr/item/MS2_1976__39_166500/