@article{bwmeta1.element.bwnjournal-article-fmv62i1p20bwm,
author = {J. P\l onka},
title = {Some remarks on sums of direct systems of algebras},
journal = {Fundamenta Mathematicae},
volume = {63},
year = {1968},
pages = {301-308},
zbl = {0187.28703},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv62i1p20bwm}
}
J. Płonka. Some remarks on sums of direct systems of algebras. Fundamenta Mathematicae, Tome 63 (1968) pp. 301-308. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv62i1p20bwm/