@article{bwmeta1.element.bwnjournal-article-smv65i1p3bwm,
author = {Andrzej Pokrzywa},
title = {Method of orthogonal projections and approximation of the spectrum of a bounded operator},
journal = {Studia Mathematica},
volume = {64},
year = {1979},
pages = {21-29},
zbl = {0437.47004},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv65i1p3bwm}
}
Pokrzywa, Andrzej. Method of orthogonal projections and approximation of the spectrum of a bounded operator. Studia Mathematica, Tome 64 (1979) pp. 21-29. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv65i1p3bwm/