TY - JOUR AU - Ruelle, David TI - Counting unbranched subgraphs JO - Journal of Algebraic Combinatorics PY - 1999 SP - 157 EP - 160 VL - 9 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/JAC_1999__9_2_a2/ LA - en ID - JAC_1999__9_2_a2 ER -