@article{IM2_1983_20_2_a0,
     author = {V. E. Voskresenskii},
     title = {Projective invariant {Demazure} models},
     journal = {Izvestiya. Mathematics},
     pages = {189--202},
     year = {1983},
     volume = {20},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_20_2_a0/}
}