@article{JRAM_1914__144_149422,
     author = {R. Courant},
     title = {\"Uber die {Existenztheoreme} der {Potential-} und {Funktionentheorie.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {190--211},
     publisher = {mathdoc},
     volume = {144},
     year = {1914},
     zbl = {45.0668.02},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1914__144_149422/}
}