Hyperbolic Volterra equations of convolution type in Sobolev spaces
  We study the correct solvability of an abstract integro-differential equations in Hilbert space generalizing integro-differential equations arising in the theory of viscoelastisity. The equations under considerations are the abstract hyperbolic equations perturbed by the terms containing Volterra integral operators. We establish the correct solvability in the weighted Sobolev spaces of vector-valued functions on the positive semiaxis. 
Nadezhda A. Rautian and Victor V. Vlasov
math.AP math-ph math.MP