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This text was written 20 years ago, inspired by M. Somekawa's paper onK-groups attached to semi-abelian varieties (K-Theory 4 (1990), 105--119) andbefore Voevodsky's theory of presheaves with transfers. The reason why it onlyhad a limited circulation will be obvious towards the end. In view of recentdevelopments, I thought it could be useful to make it generally available.

Foncteurs de Mackey \`a r\'eciprocit\'e