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@article{10_4064_cm_9_1_1_31, author = {Roman Sikorski}, title = {Algebra of formalized languages}, journal = {Colloquium Mathematicum}, pages = {1--31}, publisher = {mathdoc}, volume = {9}, number = {1}, year = {1962}, doi = {10.4064/cm-9-1-1-31}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-9-1-1-31/} }
Roman Sikorski. Algebra of formalized languages. Colloquium Mathematicum, Tome 9 (1962) no. 1, pp. 1-31. doi : 10.4064/cm-9-1-1-31. http://geodesic.mathdoc.fr/articles/10.4064/cm-9-1-1-31/
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