Exact solution of new integrable nineteen-vertex models and quantum   spin-1 chains
  New exactly solvable nineteen vertex models and related quantum spin-1 chains are solved. Partition functions, excitation energies, correlation lengths, and critical exponents are calculated. It is argued that one of the non-critical Hamiltonians is a realization of an integrable Haldane system. The finite-size spectra of the critical Hamiltonians deviate in their structure from standard predictions by conformal invariance. 
A. Kl\"umper, S. I. Matveenko, J. Zittartz