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@article{RCM_1976__10_181656, author = {Alfonso Castro and A. C. Lazer}, title = {Applications of a max-min principle}, journal = {Revista colombiana de matematicas}, pages = {141--150}, publisher = {mathdoc}, volume = {10}, year = {1976}, zbl = {0356.35073}, url = {http://geodesic.mathdoc.fr/item/RCM_1976__10_181656/} }
Alfonso Castro; A. C. Lazer. Applications of a max-min principle. Revista colombiana de matematicas, Tome 10 (1976), pp. 141-150. http://geodesic.mathdoc.fr/item/RCM_1976__10_181656/