@article{AUPO_1994__33_1_a0,
     author = {Cal\'abek, Pavel},
     title = {A four-point problem for second-order differential systems},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {7--15},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1994},
     mrnumber = {1385740},
     zbl = {0845.34030},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1994__33_1_a0/}
}