共 4 条
- [1] ALBERTSON MO, 1976, 7TH P SE C COMB GRAP, P43
- [2] On colouring the nodes of a network [J]. PROCEEDINGS OF THE CAMBRIDGE PHILOSOPHICAL SOCIETY, 1941, 37 : 194 - 197
- [3] FAJTLOWICZ S, 1977, 8TH P SE C COMB GRAP, P273
- [4] On a problem of formal logic [J]. PROCEEDINGS OF THE LONDON MATHEMATICAL SOCIETY, 1930, 30 : 264 - 286