Planär graf (Swedish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Planär graf" in Swedish language version.

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doverpublications.com

Trudeau, Richard J. (1993). Introduction to Graph Theory (Corrected, enlarged republication.). New York: Dover Pub. sid. 64. ISBN 978-0-486-67870-2. http://store.doverpublications.com/0486678709.html. Läst 8 augusti 2012. ”Thus a planar graph, when drawn on a flat surface, either has no edge-crossings or can be redrawn without them.”