@article{ARM_1989__25_4_a0,
     author = {Rach\r{u}nkov\'a, Irena},
     title = {A four-point problem for differential equations of the second order},
     journal = {Archivum mathematicum},
     pages = {175--184},
     publisher = {mathdoc},
     volume = {25},
     number = {4},
     year = {1989},
     mrnumber = {1188062},
     zbl = {0715.34033},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1989__25_4_a0/}
}