@article{MM2_1988__62_3_155352,
     author = {J\"urgen Appell and Pjotr P. Zabrejko},
     title = {\"Uber die {L-Charakteristik} nichtlinearer {Operatoren} in {R\"aumen} integrierbarer {Funktionen.}},
     journal = {Manuscripta mathematica},
     pages = {355--368},
     publisher = {mathdoc},
     volume = {62},
     number = {3},
     year = {1988},
     zbl = {0669.47039},
     url = {http://geodesic.mathdoc.fr/item/MM2_1988__62_3_155352/}
}