NICOLOSI, F.; SKRYPNIK, I. V. Nirenberg-Gagliardo interpolation inequality and regularity of solutions of nonlinear higher order equations. Topological Methods in Nonlinear Analysis, [S. l.], v. 7, n. 2, p. 327–347, 1996. Disponível em: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.015. Acesso em: 25 jan. 2022.