Remark on the Graphs with a Central Symmetry. A. Kotzig; F. Glivjak; J. Plesnik — 1970 Monatshefte für Mathematik
Some Results on the Oberwolfach Problem. (Decomposition of Completet Graphs into Isomorphic Quadratic Factors). Pavol Hell; A. Kotzig; A. Rosa — 1975 Aequationes mathematicae
Some Results on the Oberwolfach Problem. (Decomposition of Complete Graphs into Isomorphic Quadratic Factors). (Short Communication). Pavol Hell; A. Kotzig; A. Rosa — 1974 Aequationes mathematicae