@article{10_4007_annals_2010_171_533,
     author = {Patrick Brosnan and Zinovy Reichstein and Angelo Vistoli},
     title = {Essential dimension, spinor groups, and quadratic forms},
     journal = {Annals of mathematics},
     pages = {533--544},
     publisher = {mathdoc},
     volume = {171},
     number = {1},
     year = {2010},
     doi = {10.4007/annals.2010.171.533},
     mrnumber = {2630047},
     zbl = {05712735},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4007/annals.2010.171.533/}
}