@article{10_4064_aa_41_1_55_70,
     author = {Craig Cordes},
     title = {Quadratic forms over fields with four quaternion algebras},
     journal = {Acta Arithmetica},
     pages = {55--70},
     publisher = {mathdoc},
     volume = {41},
     number = {1},
     year = {1982},
     doi = {10.4064/aa-41-1-55-70},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/aa-41-1-55-70/}
}