TY - JOUR AU - Tutte, W. T. TI - The Non-Biplanar Character of the Complete 9-Graph JO - Canadian mathematical bulletin PY - 1963 SP - 319 EP - 330 VL - 6 IS - 3 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1963-026-x/ DO - 10.4153/CMB-1963-026-x ID - 10_4153_CMB_1963_026_x ER -