1.
PAPAGEORGIOU, Nikolaos S., SANTOS, Sandrina Rafaela Andrade and STAICU, Vasile. Nontrivial solutions for nonvariational quasilinear Neumann problems. Topological Methods in Nonlinear Analysis. Online. 23 April 2010. Vol. 36, no. 1, pp. 39 - 59. [Accessed 19 May 2026].