@article{107013, author = {Juhani Nieminen}, title = {Operations on graphs determining congruences on graphs}, journal = {Archivum Mathematicum}, volume = {014}, year = {1978}, pages = {215-218}, zbl = {0402.05047}, mrnumber = {512764}, language = {en}, url = {http://dml.mathdoc.fr/item/107013} }
Nieminen, Juhani. Operations on graphs determining congruences on graphs. Archivum Mathematicum, Tome 014 (1978) pp. 215-218. http://gdmltest.u-ga.fr/item/107013/
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