TY - JOUR AU - Cori, R. AU - Machi', A. TI - Flows on hypermaps JO - Glasgow mathematical journal PY - 1988 SP - 17 EP - 29 VL - 30 IS - 1 UR - http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006996/ DO - 10.1017/S0017089500006996 ID - 10_1017_S0017089500006996 ER -