@article{MZ_1967__101_170841,
     author = {Howard Osborn},
     title = {Derivations of {C...} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {265--268},
     year = {1967},
     volume = {101},
     zbl = {0158.04401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1967__101_170841/}
}