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4. On the differential geometry of a Grassmann manifold;Akivis;Tensor (N.S.),1982
5. M.A. Akivis, Completely isotropic submanifolds of a four-dimensional pseudoconformal structure, Izv. Vyssh. Uchebn. Zaved. Mat. 1983 (1) (248) 3–11 (in Russian).