Hopf conjecture (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Hopf conjecture" in English language version.

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ams.org

Chern, Shiing-Shen (1966). "On curvature and characteristic classes of a Riemann manifold". Abhandlungen aus dem Mathematischen Seminar der Universität Hamburg. 20 (1–2): 117–126. doi:10.1007/BF02960745. MR 0075647.
Weinstein, Alan (1970). "Positively curved n-manifolds in $\mathbb {R} ^{n+2}$ ". Journal of Differential Geometry. 14 (1): 1–4. doi:10.4310/jdg/1214429270. MR 0264562.
Yau, Shing-Tung (1982), "Problem section", Seminar on Differential Geometry, Annals of Mathematics Studies, vol. 102, Princeton, N.J.: Princeton University Press, pp. 669–706, ISBN 0-691-08268-5, MR 0645728
Gromoll, Detlef; Klingenberg, Wilhelm; Meyer, Wolfgang (1968). Riemannsche Geometrie im Grossen. Lecture Notes in Mathematics. Vol. 55. Berlin-New York: Springer Verlag. MR 0229177.
Bourguignon, Jean-Pierre (1975), "Some constructions related to H. Hopf's conjecture on product manifolds", Differential Geometry, Proceedings of Symposia in Pure Mathematics, vol. 27, Providence, R.I.: American Mathematical Society, pp. 33–37, MR 0380906
Weinstein, Alan (1970). "Positively curved n-manifolds in $\mathbb {R} ^{n+2}$ ". Journal of Differential Geometry. 4 (1): 1–4. doi:10.4310/jdg/1214429270. MR 0264562.
Dmitri Burago and Sergei Ivanov, Riemannian tori without conjugate points are flat, Geometric and Functional Analysis 4 (1994), no. 3, 259-269, doi:10.1007/BF01896241, MR1274115.