@article{AUPO_1994__33_1_a12,
     author = {Rach\r{u}nkov\'a, Irena},
     title = {Sign conditions in nonlinear boundary value problems},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {117--124},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1994},
     mrnumber = {1385752},
     zbl = {0845.34036},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1994__33_1_a12/}
}