@article{10_1155_S1048953394000043,
     author = {Cabada, Alberto},
     title = {The method of lower and upper solutions for th-order periodic boundary value problems.},
     journal = {International Journal of Stochastic Analysis},
     pages = {33},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {1994},
     doi = {10.1155/S1048953394000043},
     zbl = {0801.34026},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/articles/10.1155/S1048953394000043/}
}