@article{CMJ_2005__55_3_a5,
     author = {Guo, Yanping and Gao, Ying},
     title = {The method of upper and lower solutions for a {Lidstone} boundary value problem},
     journal = {Czechoslovak Mathematical Journal},
     pages = {639--652},
     publisher = {mathdoc},
     volume = {55},
     number = {3},
     year = {2005},
     mrnumber = {2153088},
     zbl = {1081.34019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005__55_3_a5/}
}