Hecke transformation for orthogonal bundles and stability of Picard   bundles
  We define Hecke transformation for orthogonal bundles over a compact Riemann surface. Using the cycles on a moduli space of orthogonal bundles given by Hecke transformations, we prove that the projectivized Picard bundle on the moduli space is stable. 
Indranil Biswas, Tomas L. Gomez
math.AG