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@article{10_4064_fm_79_3_209_212, author = {R. Solomon}, title = {A type of {\ensuremath{\beta}N} with $\ensuremath{\aleph}_0$ relative types}, journal = {Fundamenta Mathematicae}, pages = {209--212}, publisher = {mathdoc}, volume = {79}, number = {3}, year = {1973}, doi = {10.4064/fm-79-3-209-212}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-79-3-209-212/} }
R. Solomon. A type of βN with $ℵ_0$ relative types. Fundamenta Mathematicae, Tome 79 (1973) no. 3, pp. 209-212. doi : 10.4064/fm-79-3-209-212. http://geodesic.mathdoc.fr/articles/10.4064/fm-79-3-209-212/
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