TY - JOUR AU - Nieminen, U. J. TI - The block plan problem. A graphtheoretic approach JO - Kybernetika PY - 1973 SP - 365 EP - 373 VL - 9 IS - 5 UR - http://geodesic.mathdoc.fr/item/KYB_1973_9_5_a3/ LA - en ID - KYB_1973_9_5_a3 ER -