@article{MAN_1989__283_1_164493,
     author = {Klaus Bongartz},
     title = {Schichten von {Matrizen} sind rationale {Variet\"aten.}},
     journal = {Mathematische Annalen},
     pages = {53--64},
     year = {1989},
     volume = {283},
     number = {1},
     zbl = {0641.14015},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__283_1_164493/}
}