1.
AIZICOVICI, Sergiu, PAPAGEORGIOU, Nikolaos S. and STAICU, Vasile. Existence and multiplicity of solutions for resonant nonlinear Neumann problems. Topological Methods in Nonlinear Analysis. Online. 23 April 2010. Vol. 35, no. 2, pp. 235 - 252. [Accessed 12 December 2024].