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@article{JLT_1992_2_1_a1, author = {J. Hilgert}, title = {Convexity {Properties} of {Grassmannians}}, journal = {Journal of Lie theory}, pages = {013--02}, publisher = {mathdoc}, volume = {2}, number = {1}, year = {1992}, url = {http://geodesic.mathdoc.fr/item/JLT_1992_2_1_a1/} }
J. Hilgert. Convexity Properties of Grassmannians. Journal of Lie theory, Tome 2 (1992) no. 1, pp. 013-02. http://geodesic.mathdoc.fr/item/JLT_1992_2_1_a1/