@article{EJDE_2015__2015__a88,
     author = {Aizicovici,  Sergiu and Papageorgiou,  Nikolaos S. and Staicu,  Vasile},
     title = {Positive solutions for parametric nonlinear periodic problems with competing nonlinearities},
     journal = {Electronic journal of differential equations},
     year = {2015},
     volume = {2015},
     zbl = {1318.34037},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2015__2015__a88/}
}