Differential transcendency in the theory of linear differential systems   with constant coefficients
  In this paper we consider a reduction of a non-homogeneous linear system of first order operator equations to a totally reduced system. Obtained results are applied to Cauchy problem for linear differential systems with constant coefficients and to the question of differential transcendency. 
Branko Malesevic, Dragana Todoric, Ivana Jovovic, Sonja Telebakovic