TY - JOUR AU - Klapper, A. TI - Selmer group estimates arising from the existence of canonical subgroups JO - Compositio Mathematica PY - 1989 SP - 121 EP - 137 VL - 71 IS - 2 PB - Kluwer Academic Publishers UR - http://archive.numdam.org/item/CM_1989__71_2_121_0/ LA - en ID - CM_1989__71_2_121_0 ER -