@article{GDZPPN002332353, title = {The Quadratic Schur Subgroup over Local and Global Fields.}, journal = {Mathematische Annalen}, volume = {283}, year = {1989}, pages = {479-490}, zbl = {0642.12013}, url = {http://dml.mathdoc.fr/item/GDZPPN002332353} }
Riehm, C. The Quadratic Schur Subgroup over Local and Global Fields.. Mathematische Annalen, Tome 283 (1989) pp. 479-490. http://gdmltest.u-ga.fr/item/GDZPPN002332353/