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@article{10_4064_cm_43_2_373_381, author = {J. P{\l}onka}, title = {On k-closure operators in graphs}, journal = {Colloquium Mathematicum}, pages = {373--381}, publisher = {mathdoc}, volume = {43}, number = {2}, year = {1980}, doi = {10.4064/cm-43-2-373-381}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-43-2-373-381/} }
J. Płonka. On k-closure operators in graphs. Colloquium Mathematicum, Tome 43 (1980) no. 2, pp. 373-381. doi : 10.4064/cm-43-2-373-381. http://geodesic.mathdoc.fr/articles/10.4064/cm-43-2-373-381/
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