The spin 1/2 Calogero-Gaudin System and its q-Deformation
  The spin 1/2 Calogero-Gaudin system and its q-deformation are exactly solved: a complete set of commuting observables is diagonalized, and the corresponding eigenvectors and eigenvalues are explicitly calculated. The method of solution is purely algebraic and relies on the co-algebra simmetry of the model. 
F. Musso and O. Ragnisco