@article{CM_1989__71_2_121_0, author = {Klapper, A.}, title = {Selmer group estimates arising from the existence of canonical subgroups}, journal = {Compositio Mathematica}, pages = {121--137}, publisher = {Kluwer Academic Publishers}, volume = {71}, number = {2}, year = {1989}, zbl = {0751.14030}, mrnumber = {1012637}, language = {en}, url = {http://www.numdam.org/item/CM_1989__71_2_121_0/} }