@article{PIM_1956_S_S_IX_09_a4,
     author = {Nikola Hajdin},
     title = {Ein {Verfahren} {Zur} {Numerischen} {L\"osung} {Der} {Randwertaufgaben} {Vom} {Elliptischen} {Typus}},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {69 },
     publisher = {mathdoc},
     volume = {_S_S_IX},
     number = {09},
     year = {1956},
     url = {http://geodesic.mathdoc.fr/item/PIM_1956_S_S_IX_09_a4/}
}