On the structure of 5- and 6-chromatic abstract graphs.
- 1 June 1964
- journal article
- Published by Walter de Gruyter GmbH in Journal für die reine und angewandte Mathematik (Crelles Journal)
- Vol. 1964 (214-215), 43-52
- https://doi.org/10.1515/crll.1964.214-215.43