@article{IM_1985__79_143192,
     author = {S. Ramanan and A. Ramanathan},
     title = {Projective normality of flag varieties and {Schubert} varieties.},
     journal = {Inventiones mathematicae},
     pages = {217--224},
     publisher = {mathdoc},
     volume = {79},
     year = {1985},
     zbl = {0553.14023},
     url = {http://geodesic.mathdoc.fr/item/IM_1985__79_143192/}
}