Alves, C. O., i L. R. de Freitas. „Multiplicity of Nonradial Solutions for a Class of Quasilinear Equations on Annulus With Exponential Critical Growth”. Topological Methods in Nonlinear Analysis, t. 39, nr 2, kwiecień 2012, s. 243-62, https://apcz.umk.pl/TMNA/article/view/TMNA.2012.014.