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@article{PORMA_1973__32_1_115186, author = {Farlow, S.J.}, title = {Periodic solutions of nonlinear boundary value problems of the second kind}, journal = {Portugaliae mathematica}, pages = {25--37}, publisher = {mathdoc}, volume = {32}, number = {1}, year = {1973}, mrnumber = {0322327}, zbl = {0252.35036}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1973__32_1_115186/} }
Farlow, S.J. Periodic solutions of nonlinear boundary value problems of the second kind. Portugaliae mathematica, Tome 32 (1973) no. 1, pp. 25-37. http://geodesic.mathdoc.fr/item/PORMA_1973__32_1_115186/