二维空间 (Chinese Wikipedia)

Analysis of information sources in references of the Wikipedia article "二维空间" in Chinese language version.

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1web.archive.org

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1^st place

1doverpublications.com

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8,461^st place

archive.org

S. Lipschutz; M. Lipson. Linear Algebra (Schaum’s Outlines) 4th. McGraw Hill. 2009. ISBN 978-0-07-154352-1.
M.R. Spiegel; S. Lipschutz; D. Spellman. Vector Analysis (Schaum’s Outlines) 2nd. McGraw Hill. 2009. ISBN 978-0-07-161545-7.

doverpublications.com

store.doverpublications.com

Trudeau, Richard J. Introduction to Graph Theory Corrected, enlarged republication. New York: Dover Pub. 1993: 64 [8 August 2012]. ISBN 978-0-486-67870-2. （原始内容存档于2019-05-05）. Thus a planar graph, when drawn on a flat surface, either has no edge-crossings or can be redrawn without them.

web.archive.org

Trudeau, Richard J. Introduction to Graph Theory Corrected, enlarged republication. New York: Dover Pub. 1993: 64 [8 August 2012]. ISBN 978-0-486-67870-2. （原始内容存档于2019-05-05）. Thus a planar graph, when drawn on a flat surface, either has no edge-crossings or can be redrawn without them.