The general differential-geometric structure of multidimensional   Delsarte transmutation operators in parametric functional spaces and their   applications in soliton theory. Part 2
  The structure properties of multidimensional Delsarte transmutation operators in parametirc functional spaces are studied by means of differential-geometric tools. It is shown that kernels of the corresponding integral operator expressions depend on the topological structure of related homological cycles in the coordinate space. As a natural realization of the construction presented we build pairs of Lax type commutive differential operator expressions related via a Darboux-Backlund transformation having a lot of applications in solition theory. Some results are also sketched concerning theory of Delsarte transmutation operators for affine polynomial pencils of multidimensional differential operators. 
J. Golenia, Y.A. Prykarpatsky, A.M. Samoilenko, A.K. Prykarpatsky