@article{GDZPPN00218222X,
title = {Variance bounds and orthogonal expansions in Hilbert space with an application to inequalities for gamma functions and ...},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {228},
year = {1967},
pages = {147-153},
zbl = {0147.38105},
url = {http://dml.mathdoc.fr/item/GDZPPN00218222X}
}
Ruben, Harold. Variance bounds and orthogonal expansions in Hilbert space with an application to inequalities for gamma functions and .... Journal für die reine und angewandte Mathematik, Tome 228 (1967) pp. 147-153. http://gdmltest.u-ga.fr/item/GDZPPN00218222X/