@article{1031710530, author = {Lyndon, R. C.}, title = {A theorem of Friedrichs.}, journal = {Michigan Math. J.}, volume = {3}, number = {2}, year = {1955}, pages = { 27-29}, language = {en}, url = {http://dml.mathdoc.fr/item/1031710530} }
Lyndon, R. C. A theorem of Friedrichs.. Michigan Math. J., Tome 3 (1955) no. 2, pp. 27-29. http://gdmltest.u-ga.fr/item/1031710530/