Bott, Raoul Vector fields on spheres and allied problems. (English) Zbl 0105.17201 Enseign. Math., II. Sér. 7, 125-138 (1962). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Keywords:topology PDFBibTeX XMLCite \textit{R. Bott}, Enseign. Math. (2) 7, 125--138 (1962; Zbl 0105.17201)