@article{1102945271, author = {Hsia, J. S. and Johnson, Robert P.}, title = {Round and Pfister forms over $R(t)$.}, journal = {Pacific J. Math.}, volume = {49}, number = {2}, year = {1973}, pages = { 101-108}, language = {en}, url = {http://dml.mathdoc.fr/item/1102945271} }
Hsia, J. S.; Johnson, Robert P. Round and Pfister forms over $R(t)$.. Pacific J. Math., Tome 49 (1973) no. 2, pp. 101-108. http://gdmltest.u-ga.fr/item/1102945271/