@article{IM_1986__85_143359,
     author = {L. M\"ahe},
     title = {Theoreme de {Pfister} pour les varietes et anneaux de {Witt} reduits.},
     journal = {Inventiones mathematicae},
     pages = {53--72},
     year = {1986},
     volume = {85},
     url = {http://geodesic.mathdoc.fr/item/IM_1986__85_143359/}
}