@article{GDZPPN002426439,
title = {Positivity Improving Operators and Hypercontractivity.},
journal = {Mathematische Zeitschrift},
volume = {180},
year = {1982},
pages = {225-234},
zbl = {0472.47015},
url = {http://dml.mathdoc.fr/item/GDZPPN002426439}
}
Borell, Christer. Positivity Improving Operators and Hypercontractivity.. Mathematische Zeitschrift, Tome 180 (1982) pp. 225-234. http://gdmltest.u-ga.fr/item/GDZPPN002426439/