KRÍZEK, M.; NEITTAANMÄKI, P. On the validity of Friedrichs’ inequalities. MATHEMATICA SCANDINAVICA, [S. l.], v. 54, p. 17–26, 1984. DOI: 10.7146/math.scand.a-12037. Disponível em: https://www.mscand.dk/article/view/12037. Acesso em: 5 may. 2024.