@article{10_1017_S0017089500006558,
     author = {Mammone, P. and Tignol, J. P.},
     title = {Clifford division algebras and anisotropic quadratic forms: two counterexamples},
     journal = {Glasgow mathematical journal},
     pages = {227--228},
     year = {1986},
     volume = {28},
     number = {2},
     doi = {10.1017/S0017089500006558},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006558/}
}