@article{GDZPPN002436116,
title = {Towards a "Matrix Theory" for Unbounded Operator Matrices.},
journal = {Mathematische Zeitschrift},
volume = {202},
year = {1989},
pages = {57-68},
zbl = {0672.47001},
url = {http://dml.mathdoc.fr/item/GDZPPN002436116}
}
Nagel, Rainer. Towards a "Matrix Theory" for Unbounded Operator Matrices.. Mathematische Zeitschrift, Tome 202 (1989) pp. 57-68. http://gdmltest.u-ga.fr/item/GDZPPN002436116/