TY - JOUR AU - Zelinka, Bohdan TI - Signed domination numbers of directed graphs JO - Czechoslovak Mathematical Journal PY - 2005 SP - 479 EP - 482 VL - 55 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/CMJ_2005__55_2_a17/ LA - en ID - CMJ_2005__55_2_a17 ER -