Chern, Shiing-Shen Some new characterizations of the Euclidean sphere. (English) Zbl 0063.00833 Duke Math. J. 12, 279-290 (1945). Not reviewed Cited in 1 ReviewCited in 40 Documents PDFBibTeX XMLCite \textit{S.-S. Chern}, Duke Math. J. 12, 279--290 (1945; Zbl 0063.00833) Full Text: DOI Euclid