@article{10_1017_S001708950000690X,
     author = {Robinson, P. L.},
     title = {Clifford algebras and isotropes},
     journal = {Glasgow mathematical journal},
     pages = {249--257},
     year = {1987},
     volume = {29},
     number = {2},
     doi = {10.1017/S001708950000690X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708950000690X/}
}