@article{IM_1977__39_142464,
     author = {M. Demazure},
     title = {Automorphismes et deformations des varietes de {Borel}},
     journal = {Inventiones mathematicae},
     pages = {179--186},
     publisher = {mathdoc},
     volume = {39},
     year = {1977},
     zbl = {0406.14030},
     url = {http://geodesic.mathdoc.fr/item/IM_1977__39_142464/}
}