2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186949A technique to sum up the regular corrections appearing under the analytic continuation from the spacelike momentum region to the timelike one is proposed. A perturbative part of the inclusive semileptonic decay width of the tau-lepton in analyzed in detail.Electronic version of the published paper, latex, 6 pagesHigh Energy Physics - Phenomenologytext