1. Invariant imbedding and the reduction of two-point boundary-value problems to initial-value problems;Bellman,1960
2. An Application of Invariant Imbedding to the Solution of Mixed Boundary-Value Problems;Distefano,1968
3. On solutions of Riccati's equation as functions of initial values;Redheffer;J. Rational Mech. Anal.,1956
4. A numerical method for coupled differential equations;Denman,1968
5. Dynamic Programming and Partial Differential Equations;Angel,1971