Publications
- Ringel, Gerhard; Youngs, J.W.T. (1968). "Solution of the Heawood map-coloring problem". Proc. Nat. Acad. Sci. USA 60 (2): 438–445. doi:10.1073/pnas.60.2.438. PMC 225066. PMID 16591648. MR0228378. //www.ncbi.nlm.nih.gov/pmc/articles/PMC225066/.
- Hartsfield, Nora; Ringel, Gerhard (1990). Pearls in graph theory. Academic Press, Boston, MA. ISBN 0-12-328552-6.
Read more about this topic: Gerhard Ringel
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“Dr. Calder [a Unitarian minister] said of Dr. [Samuel] Johnson on the publications of Boswell and Mrs. Piozzi, that he was like Actaeon, torn to pieces by his own pack.”
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