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@article{IM_1993__112_3_144098, author = {Jens Heber}, title = {On the geometric rank of homogeneous spaces of nonpositive curvature.}, journal = {Inventiones mathematicae}, pages = {151--170}, publisher = {mathdoc}, volume = {112}, number = {3}, year = {1993}, zbl = {0792.53048}, url = {http://geodesic.mathdoc.fr/item/IM_1993__112_3_144098/} }
Jens Heber. On the geometric rank of homogeneous spaces of nonpositive curvature.. Inventiones mathematicae, Tome 112 (1993) no. 3, pp. 151-170. http://geodesic.mathdoc.fr/item/IM_1993__112_3_144098/