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@article{10_4064_cm_20_2_209_214, author = {J. P{\l}onka}, title = {On sums of direct systems of {Boolean} algebras}, journal = {Colloquium Mathematicum}, pages = {209--214}, publisher = {mathdoc}, volume = {20}, number = {2}, year = {1969}, doi = {10.4064/cm-20-2-209-214}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-20-2-209-214/} }
J. Płonka. On sums of direct systems of Boolean algebras. Colloquium Mathematicum, Tome 20 (1969) no. 2, pp. 209-214. doi : 10.4064/cm-20-2-209-214. http://geodesic.mathdoc.fr/articles/10.4064/cm-20-2-209-214/
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