MathSciNet bibliographic data MR818350 (87c:53128) 53C65 Harvey, Reese; Morgan, Frank The faces of the Grassmannian of three-planes in ${\bf R}\sp 7$${\bf R}\sp 7$ (calibrated geometries on ${\bf R}\sp 7$${\bf R}\sp 7$). Invent. Math. 83 (1986), no. 2, 191–228. Article

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