2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/44762We review some recent applications of QCD sum rules to $B$-decays. These include the determination of the leptonic constant $f_B$ and of the semileptonic transition amplitudes of the $B$-meson into negative and positive parity charmed states.25 pages, 1 figure (not included) available upon request, TeX, BARI-TH/92-132, UTS-UFT-93-3High Energy Physics - Phenomenologytext