Whitney, Hassler Planar graphs. (English) Zbl 0008.08501 Fundam. Math. 21, 73-84 (1933). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 11 Documents Keywords:topology PDFBibTeX XMLCite \textit{H. Whitney}, Fundam. Math. 21, 73--84 (1933; Zbl 0008.08501) Full Text: DOI EuDML