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@article{10_21136_CPM_1981_108493, author = {Zelinka, Bohdan}, title = {Graphs of semigroups}, journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky}, pages = {407--408}, publisher = {mathdoc}, volume = {106}, number = {4}, year = {1981}, doi = {10.21136/CPM.1981.108493}, mrnumber = {637820}, zbl = {0479.05033}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1981.108493/} }
Zelinka, Bohdan. Graphs of semigroups. Časopis pro pěstování matematiky, Tome 106 (1981) no. 4, pp. 407-408. doi : 10.21136/CPM.1981.108493. http://geodesic.mathdoc.fr/articles/10.21136/CPM.1981.108493/
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