TY - JOUR AU - Zelinka, Bohdan TI - Small directed graphs as neighbourhood graphs JO - Czechoslovak Mathematical Journal PY - 1988 SP - 269 EP - 273 VL - 38 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1988.102221/ DO - 10.21136/CMJ.1988.102221 LA - en ID - 10_21136_CMJ_1988_102221 ER -