Goursat problem in the non-classical treatment for a sixth order   pseudoparabolic equation
  In the paper the Goursat problem with non classical boundary conditions not requiring the agreement conditions is considered for a sixth order pseudoparabolic equation with the classical boundary condition is substantiated in the case if the solution of the stated problem is sought in S.L.Sobolev anisotropic space. 
Ilgar G. Mamedov
math.AP