@article{CMH_1939__12_138746,
     author = {M. Eichler},
     title = {Allgemeine {Integration} einiger partieller {Differentialgleichungen} der mathematischen {Physik} durch {Quaternionenfunktionen.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {212--224},
     publisher = {mathdoc},
     volume = {12},
     year = {1939},
     zbl = {66.0440.01},
     url = {http://geodesic.mathdoc.fr/item/CMH_1939__12_138746/}
}