Nicolosi, F. and Skrypnik, I. V. (1996) “Nirenberg-Gagliardo interpolation inequality and regularity of solutions of nonlinear higher order equations”, Topological Methods in Nonlinear Analysis, 7(2), pp. 327–347. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.1996.015 (Accessed: 28 March 2024).