@article{GDZPPN002357860, title = {On the validity of Friedrichs' inequalities.}, journal = {Mathematica Scandinavica}, volume = {55}, year = {1984}, pages = {17-26}, zbl = {0555.35003}, url = {http://dml.mathdoc.fr/item/GDZPPN002357860} }
Neittaanmäki, Pekka; Krízek, Michal. On the validity of Friedrichs' inequalities.. Mathematica Scandinavica, Tome 55 (1984) pp. 17-26. http://gdmltest.u-ga.fr/item/GDZPPN002357860/