Yukawa coupling corrections to stop, sbottom, and stau production in e(+)e(-) annihilation

We calculate within the MSSM the one-loop Yukawa coupling corrections to th e processes e+e- --> (t) over tilde(i)(t) over tilde(j), (b) over tilde(i)( b) over tilde(j), <(tau)over tilde>(i)<(tau)over tilde>(j) in order of Yuka wa coupling squared. These corrections are due to the exchange of charginos , neutralinos, charged and neutral Higgs bosons, and charged and neutral Hi ggs ghosts. We give the complete analytical formulae. We also perform a det ailed numerical analysis of the Yukawa coupling corrections, including also the SUSY-QCD corrections. It turns out that for stop and sbottom productio n the Yukawa coupling corrections are typically similar to +/-10% of the tr ee-level cross section. For stau production they are about +/-5%.