Adjoint orbits of semi-simple Lie groups and Lagrangean submanifolds
  We give various realizations of the adjoint orbits of a semi-simple Lie group and describe their symplectic geometry. We then use these realizations to identify a family of Lagrangean submanifolds of the orbits. 
Elizabeth Gasparim, Lino Grama, and Luiz A. B. San Martin
math.SG math.RT