@article{1077375074,
author = {Nussbaum, A. E.},
title = {Reduction theory for unbounded closed operators in Hilbert space},
journal = {Duke Math. J.},
volume = {31},
number = {1},
year = {1964},
pages = { 33-44},
language = {en},
url = {http://dml.mathdoc.fr/item/1077375074}
}
Nussbaum, A. E. Reduction theory for unbounded closed operators in Hilbert space. Duke Math. J., Tome 31 (1964) no. 1, pp. 33-44. http://gdmltest.u-ga.fr/item/1077375074/