@article{MAN_1984__267_163880,
     author = {Achim Clausing},
     title = {P\'olya {Operators} {II:} {Complete} {Concavity.}},
     journal = {Mathematische Annalen},
     pages = {61--82},
     publisher = {mathdoc},
     volume = {267},
     year = {1984},
     zbl = {0533.34025},
     url = {http://geodesic.mathdoc.fr/item/MAN_1984__267_163880/}
}