Morris-Shore transformation with unequal detunings
  The aim of this paper is to analyze the MS transformation in the case of weak deviation of the condition for equal detunings, which in necessary for factorization towards set of two-state systems and set of decouple states. Some elements concerning the general solution of the MS transformation will be also discussed. 
G. S. Vasilev, N. V. Vitanov
quant-ph