1. 4-chrome Graphen und vollständige 4-Graphen;Dirac;Math. Nachr.,1960
2. Flows in Networks;Ford,1962
3. Graph Theory;Harary,1969
4. On the maximal number of disjoint chains connecting given terminals in a graph;Kelmans;San Francisco Annual Meeting of the AMS,1981
5. Is there a walk around m given vertices in a k-connected graph?;Kelmans;G.T.N.,1980