@article{MZ_1991__208_3_174321,
     author = {A.R. Wadsworth and P. Mammone and R. Moresi},
     title = {u-invariants of fields of characteristic 2.},
     journal = {Mathematische Zeitschrift},
     pages = {335--348},
     publisher = {mathdoc},
     volume = {208},
     number = {3},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MZ_1991__208_3_174321/}
}