@article{MZ_1996__222_3_174901,
     author = {Anthony Joseph and Gail Letzter},
     title = {Rosso's form and quantized {Kac} {Moody} algebras.},
     journal = {Mathematische Zeitschrift},
     pages = {543--572},
     publisher = {mathdoc},
     volume = {222},
     number = {3},
     year = {1996},
     zbl = {0858.17011},
     url = {http://geodesic.mathdoc.fr/item/MZ_1996__222_3_174901/}
}