[3] CHARTRAND G., KRONK H. V., WALL C. E.:
The point-arboricity of a graph. Israel J. Math., 6, 1968, 169-175.
MR 0236049 |
Zbl 0164.54201
[4] CHARTRAND G., KRONK H. V.:
The point-arboricity of planar graphs. J. London Math. Soc., 44, 1969, 612-616.
MR 0239996 |
Zbl 0175.50505
[5] KRONK H. V., MITCHEM J.:
Critical point-arboritic graphs. J. London Math. Soc., (2) 9, 1975, 459-466.
MR 0360334 |
Zbl 0298.05132