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@article{10_4064_cm_9_2_171_182, author = {Roman Sikorski}, title = {On open theories}, journal = {Colloquium Mathematicum}, pages = {171--182}, publisher = {mathdoc}, volume = {9}, number = {2}, year = {1962}, doi = {10.4064/cm-9-2-171-182}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-9-2-171-182/} }
Roman Sikorski. On open theories. Colloquium Mathematicum, Tome 9 (1962) no. 2, pp. 171-182. doi : 10.4064/cm-9-2-171-182. http://geodesic.mathdoc.fr/articles/10.4064/cm-9-2-171-182/
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