@article{bwmeta1.element.bwnjournal-article-smv87i1p10bwm,
author = {Andrzej Krupa and Bogdan Zawisza},
title = {Ultrapowers of unbounded selfadjoint operators},
journal = {Studia Mathematica},
volume = {85},
year = {1987},
pages = {101-120},
zbl = {0645.47022},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv87i1p10bwm}
}
Krupa, Andrzej; Zawisza, Bogdan. Ultrapowers of unbounded selfadjoint operators. Studia Mathematica, Tome 85 (1987) pp. 101-120. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv87i1p10bwm/