@article{GDZPPN002434032,
title = {On the Closedness of the Sum of Two Closed Operators.},
journal = {Mathematische Zeitschrift},
volume = {194},
year = {1987},
pages = {189-202},
zbl = {0615.47002},
url = {http://dml.mathdoc.fr/item/GDZPPN002434032}
}
Dore, Giovanni; Venni, Alberto. On the Closedness of the Sum of Two Closed Operators.. Mathematische Zeitschrift, Tome 194 (1987) pp. 189-202. http://gdmltest.u-ga.fr/item/GDZPPN002434032/