@article{AUPO_1990__29_1_a2,
     author = {Andres, J\'an},
     title = {On some modification of the {Levinson} operator and its application to a three-point boundary value problem},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {35--43},
     publisher = {mathdoc},
     volume = {29},
     number = {1},
     year = {1990},
     mrnumber = {1144829},
     zbl = {0756.34024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1990__29_1_a2/}
}