TY - JOUR AU - Cockayne, E. J. AU - Hedetniemi, S. T. AU - Miller, D. J. TI - Properties of Hereditary Hypergraphs and Middle Graphs JO - Canadian mathematical bulletin PY - 1978 SP - 461 EP - 468 VL - 21 IS - 4 UR - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1978-079-5/ DO - 10.4153/CMB-1978-079-5 ID - 10_4153_CMB_1978_079_5 ER -