Radiative corrections in the MSSM beyond one-loop: precision observables and neutral Higgs masses

Recent results on two-loop QCD corrections to electroweak precision observables and to the neutral Higgs boson masses in the Minimal Supersymmetric Standard Model are presented. Main emphasis is on the QCD corrections to electroweak precision observables via squark contributions to the rho -parameter, and on the Feynman-diagrammatic calculation of the masses of the MSSM Higgs bosons h/sup 0/, H/sup 0/ yielding the currently most precise prediction of the lightest Higgs mass m/sub h/ within the Feynman-graph approach. (22 refs).