@article{MAN_1981__258_163599,
     author = {W. Meier},
     title = {Rational {Universal} {Fibrations} and {Flag} {Manifolds.}},
     journal = {Mathematische Annalen},
     pages = {329--340},
     year = {1981},
     volume = {258},
     zbl = {0466.55012},
     url = {http://geodesic.mathdoc.fr/item/MAN_1981__258_163599/}
}