1. Benenti, S., and Francaviglia, M. (1978). ?The theory of Separability of the Hamilton-Jacobi Equation and its Applications to General Relativity? (to appear).
2. Demianski, M., and Francaviglia, M. (1978). ?Type D Space-Times with a Killing Tensor? (to appear).
3. Carter, B. (1968).Commun. Math. Phys.,10, 280?310.
4. Benenti, S. (1976).C. R. Acad. Sci. Paris,283, 215?218.
5. Benenti, S. (1977).Rep. Math. Phys.,12, 311?316.