TY - JOUR AU - G. Sh. Tsitsiashvili TI - The computational complexity of optimal blocking of vertices in the digraph JO - Dalʹnevostočnyj matematičeskij žurnal PY - 2020 SP - 267 EP - 270 VL - 20 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/DVMG_2020_20_2_a14/ LA - ru ID - DVMG_2020_20_2_a14 ER -