@article{10_4064_ap_24_1_87_102,
     author = {Zdzis{\l}aw Denkowski},
     title = {The boundary value problems for ordinary non-linear differential and difference equations of the fourth order},
     journal = {Annales Polonici Mathematici},
     pages = {87--102},
     publisher = {mathdoc},
     volume = {24},
     number = {1},
     year = {1970},
     doi = {10.4064/ap-24-1-87-102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-24-1-87-102/}
}