1. Differential-Difference Equations;Bellman,1963
2. A Liapunov functional for a matrix difference-differential equation;Castelan;J. Differential Equations,1977
3. An algorithm for computing Liapunov functionals for some differential-difference equations;Datko,1972
4. Linear autonomous neutral differential equations in a Banach space;Datko;J. Differential Equations,1977
5. Representation of solutions and stability of linear differential-difference equations in a Banach space;Datko;J. Differential Equations,1978