Topological Methods in Nonlinear Analysis publishes research and survey papers on a wide range of nonlinear analysis, giving preference to those which employ topological methods.
A further generalization of midpoint convexity
of multimaps towards common fixed point Theorems and applications
Irene Benedetti, et al. (2015)
The existence of minimizers of the action functional without convexity assumption
Aleksandra Orpel. (2002)