@article{IM_1979__55_186132,
     author = {M. Demazure},
     title = {Sur la structure birationelle de {Bu.}},
     journal = {Inventiones mathematicae},
     pages = {177--184},
     year = {1979},
     volume = {55},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/IM_1979__55_186132/}
}