MathSciNet bibliographic data MR660620 57N15 (05C10 05C15 57Q15 57Q99) Ferri, Massimo; Gagliardi, Carlo The only genus zero \$n\$$n$-manifold is \$S\sp{n}\$$S\sp{n}$. Proc. Amer. Math. Soc. 85 (1982), no. 4, 638–642. Article

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