@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/