MathSciNet bibliographic data MR994793 (90f:53101) 53C42 (55P42 57T20) Wang, Qi Ming On totally geodesic spheres in Grassmannians and ${\rm O}(n)$${\rm O}(n)$. Proc. Amer. Math. Soc. 108 (1990), no. 3, 811–815. Article

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