TY - JOUR AU - Nenov, Nedyalko TI - On the 3-Colouring Vertex Folkman Number F(2,2,4) JO - Serdica Mathematical Journal PY - 2001 SP - 131 EP - 136 VL - 27 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SMJ2_2001_27_2_a3/ LA - en ID - SMJ2_2001_27_2_a3 ER -