Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{MM2_1979__28_154629, author = {M.H. Protter}, title = {Inequalities for {Powers} of {Unbounded} {Operators.}}, journal = {Manuscripta mathematica}, pages = {71--80}, publisher = {mathdoc}, volume = {28}, year = {1979}, zbl = {0412.47017}, url = {http://geodesic.mathdoc.fr/item/MM2_1979__28_154629/} }
M.H. Protter. Inequalities for Powers of Unbounded Operators.. Manuscripta mathematica, Tome 28 (1979), pp. 71-80. http://geodesic.mathdoc.fr/item/MM2_1979__28_154629/