@article{10_21136_CMJ_1971_101060,
     author = {Zelinka, Bohdan},
     title = {The group of autotopies of a digraph},
     journal = {Czechoslovak Mathematical Journal},
     pages = {619--624},
     publisher = {mathdoc},
     volume = {21},
     number = {4},
     year = {1971},
     doi = {10.21136/CMJ.1971.101060},
     mrnumber = {0323618},
     zbl = {0223.05111},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101060/}
}