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We study resonant tunneling through quantum-dot systems in the presence ofstrong Coulomb repulsion and coupling to the metallic leads. Motivated byrecent experiments we concentrate on (i) a single dot with two energy levelsand (ii) a double dot with one level in each dot. Each level is twofoldspin-degenerate. Depending on the level spacing these systems are physicalrealizations of different Kondo-type models. Using a real-time diagrammaticformulation we evaluate the spectral density and the non-linear conductance.The latter shows a novel triple-peak resonant structure.Comment: 4 pages, ReVTeX, 4 Postscript figure

Resonant tunneling through a two-level dot and double quantum dots