Reductions and real forms of Hamiltonian systems related to N-wave type   equations
  Reductions of N-wave type equations related to simple Lie algebras and the hierarchy of their Hamiltonian structures are studied. The reduction group G_R is realized as a subgroup of the Weyl group of the corresponding algebra. Some of the reduced equations are of physical interest. 
V. S. Gerdjikov (Institute for Nuclear Research and Nuclear Energy,   Sofia, Bulgaria), G. G. Grahovski (Institute for Nucle...