@article{10_4064_ap_58_3_221_235,
     author = {Ming-Xing Wang and Alberto Cabada and Juan Nieto},
     title = {Monotone method for nonlinear second order periodic boundary value problems with {Carath\'eodory} functions},
     journal = {Annales Polonici Mathematici},
     pages = {221--235},
     publisher = {mathdoc},
     volume = {58},
     number = {3},
     year = {1993},
     doi = {10.4064/ap-58-3-221-235},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-58-3-221-235/}
}