@article{ITA_1983__17_4_331_0, author = {Knast, Robert}, title = {Some theorems on graph congruences}, journal = {RAIRO. Informatique th\'eorique}, pages = {331--342}, publisher = {EDP-Sciences}, volume = {17}, number = {4}, year = {1983}, mrnumber = {743893}, language = {en}, url = {http://archive.numdam.org/item/ITA_1983__17_4_331_0/} }
Knast, Robert. Some theorems on graph congruences. RAIRO. Informatique théorique, Volume 17 (1983) no. 4, pp. 331-342. http://archive.numdam.org/item/ITA_1983__17_4_331_0/
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