On the Malgrange isomonodromic deformations of non-resonant meromorphic   (2x2)-connections
  We study the tau-function and theta-divisor of an isomonodromic family of linear differential (2x2)-systems with non-resonant irregular singularities. In some particular case the estimates for pole orders of the coefficient matrices of the family are applied. 
Yuliya P. Bibilo, Renat R. Gontsov
math.CA