@article{RSMUP_1973__49__195_0,
     author = {Ambrosetti, Antonio},
     title = {On the existence of multiple solutions for a class of nonlinear boundary value problems},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {195--204},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {49},
     year = {1973},
     mrnumber = {336068},
     zbl = {0273.35037},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1973__49__195_0/}
}