@article{GDZPPN002221993,
title = {Inequalities for Powers of Unbounded Operators.},
journal = {Manuscripta mathematica},
volume = {29},
year = {1979},
pages = {71-80},
zbl = {0412.47017},
url = {http://dml.mathdoc.fr/item/GDZPPN002221993}
}
Protter, M.H. Inequalities for Powers of Unbounded Operators.. Manuscripta mathematica, Tome 29 (1979) pp. 71-80. http://gdmltest.u-ga.fr/item/GDZPPN002221993/