@article{AFM_1996_21_1_a8,
     author = {Constantin P. Niculescu and Vicentiu Radulescu},
     title = {A saddle point theorem for non-smooth functionals and problems at resonance},
     journal = {Annales Fennici Mathematici},
     pages = {117--131},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AFM_1996_21_1_a8/}
}