COMBINATORIAL PROBLEMS IN THE THEORY OF GRAPHS. II
Gillian Ford, Robert Z. Norman, G. E. Uhlenbeck · Proceedings of the National Academy of Sciences · 1956
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.