2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/45989We investigate the production of Higgs bosons $A/h$ via the Yukawa process $Z\ra f\bar{f} \ra f\bar{f} A/h $ taking into account QCD corrections and fermion mass effects. We estimate the discovery reach of this process and/or bounds on the parameter space of two-Higgs doublet models which can be derived from the analysis of $b {\bar b} τ^+ τ^-$ events at LEP1. These limits have important consequences for extended models of electroweak interactions and their experimental verification/improvement are welcome.9 pages, Latex, 2 figures in uuencoded Postscript format, for correspondence: kalino@fuw.edu.pl, krawczyk@fuw.edu.plHigh Energy Physics - Phenomenologytext