Civin, Paul Two-to-one mappings of manifolds. (English) Zbl 0060.41012 Duke Math. J. 10, 49-57 (1943). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 3 Documents Keywords:topology PDFBibTeX XMLCite \textit{P. Civin}, Duke Math. J. 10, 49--57 (1943; Zbl 0060.41012) Full Text: DOI