Solvable cases of optimal control problems for integral equations
  We present a number of cases of optimal control of Volterra and Fredholm integral equations that are solvable in the sense that the problem can be reduced to a solvable integral equation. This is conceptually analogous to the role of the Riccati differential system in the optimal control of ordinary differential equations. 
S. A. Belbas and W. H. Schmidt
math.OC