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@article{10_21136_CPM_1989_118370, author = {Zelinka, Bohdan}, title = {Centers of directed cacti}, journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky}, pages = {225--229}, publisher = {mathdoc}, volume = {114}, number = {3}, year = {1989}, doi = {10.21136/CPM.1989.118370}, mrnumber = {1016631}, zbl = {0681.05034}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1989.118370/} }
Zelinka, Bohdan. Centers of directed cacti. Časopis pro pěstování matematiky, Tome 114 (1989) no. 3, pp. 225-229. doi : 10.21136/CPM.1989.118370. http://geodesic.mathdoc.fr/articles/10.21136/CPM.1989.118370/
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