Berstein, I.; Hilton, Peter J. Category and generalized Hopf invariants. (English) Zbl 0113.38301 Ill. J. Math. 4, 437-451 (1960). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 ReviewsCited in 35 Documents Keywords:topology PDF BibTeX XML Cite \textit{I. Berstein} and \textit{P. J. Hilton}, Ill. J. Math. 4, 437--451 (1960; Zbl 0113.38301) OpenURL