@article{ITA_1986__20_2_191_0, author = {Goral\v c\'\i k, P. and Goral\v c\'\i kov\'a, A. and Koubek, V\'aclav}, title = {How much semigroup structure is needed to encode graphs ?}, journal = {RAIRO - Theoretical Informatics and Applications - Informatique Th\'eorique et Applications}, volume = {20}, year = {1986}, pages = {191-206}, mrnumber = {860769}, zbl = {0601.20053}, language = {en}, url = {http://dml.mathdoc.fr/item/ITA_1986__20_2_191_0} }
Goralčík, P.; Goralčíková, A.; Koubek, V. How much semigroup structure is needed to encode graphs ?. RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications, Tome 20 (1986) pp. 191-206. http://gdmltest.u-ga.fr/item/ITA_1986__20_2_191_0/
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