TY - JOUR AU - Nebeský, Ladislav TI - Route systems and bipartite graphs JO - Czechoslovak Mathematical Journal PY - 1991 SP - 260 EP - 264 VL - 41 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1991.102457/ DO - 10.21136/CMJ.1991.102457 LA - en ID - 10_21136_CMJ_1991_102457 ER -