@article{CMJ_2001__51_2_a0,
     author = {Zelinka, Bohdan},
     title = {Signed total domination number of a graph},
     journal = {Czechoslovak Mathematical Journal},
     pages = {225--229},
     publisher = {mathdoc},
     volume = {51},
     number = {2},
     year = {2001},
     mrnumber = {1844306},
     zbl = {0977.05096},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2001__51_2_a0/}
}