Bethe Ansatz approach to the three-magnon problem in an infinite $XX$   spin chain with Izing next neighboring ferromagnetic interaction
  Using the traditional and degenerative discrete-diffractive versions of Bethe Ansatz we construct a rude set of three-magnon states in the infinite $XX$ spin chain with Izing next neighboring ferromagnetic term. 
P. N. Bibikov
nlin.SI cond-mat.str-el math-ph math.MP