@article{MZ_1973__131_171877,
     author = {Stephan Ruscheweyh and K.-J. Wirths},
     title = {\"Uber die {Faltung} schlichter {Funktionen.} {II.}},
     journal = {Mathematische Zeitschrift},
     pages = {11--24},
     publisher = {mathdoc},
     volume = {131},
     year = {1973},
     zbl = {0235.30009},
     url = {http://geodesic.mathdoc.fr/item/MZ_1973__131_171877/}
}