@article{04148955,
title = {A characterization of formally symmetric unbounded operators.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {46(60)},
year = {1989},
pages = {141-144},
zbl = {0701.47010},
language = {en},
url = {http://dml.mathdoc.fr/item/04148955}
}
Jocić, Danko. A characterization of formally symmetric unbounded operators.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 46(60) (1989) pp. 141-144. http://gdmltest.u-ga.fr/item/04148955/