A KAM algorithm for the resonant non--linear Schr\"odinger equation
  In this note we use the normal forms of the completely resonant non--linear Schr\"odinger equation on a torus (NLS) derived in previous work in order to produce, under a KAM algorithm, large families of stable and unstable quasi periodic solutions for the NLS in any number of independent frequencies. 
M. Procesi, and C. Procesi
math.AP math.DS