@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/