@article{GDZPPN001260987,
title = {Parabolicity of second order differential equations in Hubert space.},
journal = {Semigroup forum},
volume = {43},
year = {1991},
pages = {303-312},
zbl = {0743.47038},
url = {http://dml.mathdoc.fr/item/GDZPPN001260987}
}
Favini, A. Parabolicity of second order differential equations in Hubert space.. Semigroup forum, Tome 43 (1991) pp. 303-312. http://gdmltest.u-ga.fr/item/GDZPPN001260987/