Differential-geometric and topological structure of multidimensional   Delsarte transmutation operators
  A differential geometrical and topological structure of Delsarte transmutation operators in multidimension is studied, the relationships with De Rham-Hodge-Skrypnik theory of generalized differential complexes is stated. 
Yarema Prykarpatsky, Anatoliy Samoilenko, Anatoliy K. Prykarpatsky