@article{MZ_1961__76_169963,
     author = {Kurt Leichtweiss},
     title = {Zur {Riemannschen} {Geometrie} in {Grassmannschen} {Mannigfaltigkeiten.}},
     journal = {Mathematische Zeitschrift},
     pages = {334--366},
     publisher = {mathdoc},
     volume = {76},
     year = {1961},
     zbl = {0113.37102},
     url = {http://geodesic.mathdoc.fr/item/MZ_1961__76_169963/}
}