Whitehead, George W. A generalization of the Hopf invariant. (English) Zbl 0045.44202 Ann. Math. (2) 51, 192-237 (1950). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 32 Documents Keywords:Topology PDFBibTeX XMLCite \textit{G. W. Whitehead}, Ann. Math. (2) 51, 192--237 (1950; Zbl 0045.44202) Full Text: DOI