@article{AM2_1969__2_182338,
     author = {W. EICHHORN},
     title = {Funktionalgleichungen in {Vektorr\"aumen,} {Kompositionsalgebren} und {Systeme} partieller {Differentialgleichungen}},
     journal = {Aequationes mathematicae},
     pages = {287--303},
     publisher = {mathdoc},
     volume = {2},
     year = {1969},
     zbl = {0174.19903},
     url = {http://geodesic.mathdoc.fr/item/AM2_1969__2_182338/}
}