@article{MZ_1923__18_167745,
     author = {O. Perron},
     title = {Eine neue {Behandlung} der ersten {Randwertaufgabe} f\"ur ??=0},
     journal = {Mathematische Zeitschrift},
     pages = {42--54},
     publisher = {mathdoc},
     volume = {18},
     year = {1923},
     zbl = {49.0340.01},
     url = {http://geodesic.mathdoc.fr/item/MZ_1923__18_167745/}
}