@article{10_4064_ap76_3_6,
     author = {Daqing Jiang and Lingbin Kong},
     title = {A monotone method for constructing extremal solutions
to second order periodic boundary value problems},
     journal = {Annales Polonici Mathematici},
     pages = {279--286},
     publisher = {mathdoc},
     volume = {76},
     number = {3},
     year = {2001},
     doi = {10.4064/ap76-3-6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap76-3-6/}
}