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MR769145 53C20
Bourguignon, Jean-Pierre La conjecture de Hopf sur $S\sp 2\times S\sp 2$. (French) [The Hopf conjecture on $S\sp 2\times S\sp 2$] Riemannian geometry in dimension 4 (Paris, 1978/1979), 347–355, Textes Math., 3, CEDIC, Paris, 1981.
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