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 16 April 2024].