@article{IM_1992__107_1_143960,
     author = {Frank D. Grosshans},
     title = {Contractions of the actions of reductive algebraic groups in arbitrary characteristic.},
     journal = {Inventiones mathematicae},
     pages = {127--134},
     publisher = {mathdoc},
     volume = {107},
     number = {1},
     year = {1992},
     zbl = {0778.20018},
     url = {http://geodesic.mathdoc.fr/item/IM_1992__107_1_143960/}
}