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@article{10_4064_cm_12_2_209_211, author = {S. Franklin}, title = {Open and image-open relations}, journal = {Colloquium Mathematicum}, pages = {209--211}, publisher = {mathdoc}, volume = {12}, number = {2}, year = {1964}, doi = {10.4064/cm-12-2-209-211}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-12-2-209-211/} }
S. Franklin. Open and image-open relations. Colloquium Mathematicum, Tome 12 (1964) no. 2, pp. 209-211. doi : 10.4064/cm-12-2-209-211. http://geodesic.mathdoc.fr/articles/10.4064/cm-12-2-209-211/
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