On the existence of multiple solutions for a class of nonlinear boundary value problems
Rendiconti del Seminario Matematico della Università di Padova, Tome 49 (1973), pp. 195-204 
@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},
     year = {1973},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {49},
     mrnumber = {336068},
     zbl = {0273.35037},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1973__49__195_0/}
}
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Ambrosetti, Antonio. On the existence of multiple solutions for a class of nonlinear boundary value problems. Rendiconti del Seminario Matematico della Università di Padova, Tome 49 (1973), pp. 195-204. https://www.numdam.org/item/RSMUP_1973__49__195_0/

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[3] J.A. Hempel, Multiple solutions for a class of nonlinear boundary value problems, Ind. Univ. Math. J., 20 (1971), 983-996. | Zbl | MR

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