@article{CMH_1953__27_139059,
     author = {K.-F. Moppert},
     title = {\"Uber einen verallgemeinerten {Ableitungsoperator.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {140--150},
     year = {1953},
     volume = {27},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/CMH_1953__27_139059/}
}