@article{bwmeta1.element.bwnjournal-article-smv61i1p17bwm,
author = {Zbigniew S\l odkowski},
title = {An infinite family of joint spectra},
journal = {Studia Mathematica},
volume = {60},
year = {1977},
pages = {239-255},
zbl = {0369.47021},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-smv61i1p17bwm}
}
Słodkowski, Zbigniew. An infinite family of joint spectra. Studia Mathematica, Tome 60 (1977) pp. 239-255. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-smv61i1p17bwm/