@article{GDZPPN002357321, title = {On a inequality of Friedrichs.}, journal = {Mathematica Scandinavica}, volume = {50}, year = {1982}, pages = {310-322}, zbl = {0524.35100}, url = {http://dml.mathdoc.fr/item/GDZPPN002357321} }
Saranen, Jukka. On a inequality of Friedrichs.. Mathematica Scandinavica, Tome 50 (1982) pp. 310-322. http://gdmltest.u-ga.fr/item/GDZPPN002357321/