@article{1077311635, author = {Waterhouse, William C.}, title = {Self-adjoint operators and formally real fields}, journal = {Duke Math. J.}, volume = {43}, number = {1}, year = {1976}, pages = { 237-243}, language = {en}, url = {http://dml.mathdoc.fr/item/1077311635} }
Waterhouse, William C. Self-adjoint operators and formally real fields. Duke Math. J., Tome 43 (1976) no. 1, pp. 237-243. http://gdmltest.u-ga.fr/item/1077311635/