@article{10_4064_ap_34_1_1_12,
     author = {M. Schneider},
     title = {\"Uber {Randwertprobleme} f\"ur {Gleichungen} vom gemischten {Typ} im $R^3$ {(I)}},
     journal = {Annales Polonici Mathematici},
     pages = {1--12},
     publisher = {mathdoc},
     volume = {34},
     number = {1},
     year = {1977},
     doi = {10.4064/ap-34-1-1-12},
     language = {de},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-34-1-1-12/}
}