## $$B$$-sets and coloring problems.(English)Zbl 0194.56004

topology
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### References:

 [1] Gary Chartrand, Hudson V. Kronk, and Curtiss E. Wall, The point-arboricity of a graph, Israel J. Math. 6 (1968), 169 – 175. · Zbl 0164.54201 [2] Gary Chartrand and Hudson V. Kronk, The point-arboricity of planar graphs, J. London Math. Soc. 44 (1969), 612 – 616. · Zbl 0175.50505 [3] W. T. Tutte, On Hamiltonian circuits, J. London Math. Soc. 21 (1946), 98 – 101. · Zbl 0061.41306 [4] Hassler Whitney, A theorem on graphs, Ann. of Math. (2) 32 (1931), no. 2, 378 – 390. · Zbl 0002.16101
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