1. Flows in Networks;Ford,1962
2. Zum Mengerschen Graphensatz, in Beiträge zur Graphentheorie;Halin,1968
3. Súvilost a pravidelná súvilost konečných grafov;Kotzig,1956
4. A. Kotzig, Vertex splittings preserving the maximal edge connectedness of 4-regular multigraphs, to appear in J. Combinatorial Theory (B).
5. On some connectivity properties of eulerian graphs;Lovász;Acta Math. Acad. Sci. Hung.,1976