@article{DOCMA_1996__1__a1,
     author = {Szyjewski, Marek},
     title = {An invariant of quadratic forms over schemes},
     journal = {Documenta mathematica},
     pages = {449--478},
     publisher = {mathdoc},
     volume = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DOCMA_1996__1__a1/}
}