1. Graphes et hypergraphes;Berge,1970
2. Paths, trees and flowers;Edmonds;Can. J. Math.,1965
3. Graphs with prescribed degrees of vertices;Erdös;Mat Lapok,1960
4. Neuer Beweis eines Tuttelschen Satzes;Gallai;Magyar Tud. Akad. Mat. Kutató Int. Közl,1963
5. Graph Theory;Harary,1969