Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Kenneth A. Berman. Three-colourings of planar 4-valent maps. Journal of Combinatorial Theory, Series A, 30(1):82-88, 1981. [doi]
Abstract is missing.