@article{GDZPPN00232489X, title = {P\'olya Operators II: Complete Concavity.}, journal = {Mathematische Annalen}, volume = {268}, year = {1984}, pages = {61-82}, zbl = {0533.34025}, url = {http://dml.mathdoc.fr/item/GDZPPN00232489X} }
Clausing, Achim. Pólya Operators II: Complete Concavity.. Mathematische Annalen, Tome 268 (1984) pp. 61-82. http://gdmltest.u-ga.fr/item/GDZPPN00232489X/