TY - JOUR AU - Aizicovici, Sergiu AU - Papageorgiou, Nikolaos S. AU - Staicu, Vasile TI - Positive solutions for parametric nonlinear periodic problems with competing nonlinearities JO - Electronic Journal of Differential Equations PY - 2015 VL - 2015 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a88/ LA - en ID - EJDE_2015__2015__a88 ER -