1. R. Bellman and M. Wing, “Invariant Imbedding,” to appear.
2. On the principle of invariant imbedding and wave propagation through inhomogeneous media;Bellman,1956
3. Introduction to Transport Theory;Wing,1962
4. Functional equations, wave propagation and invariant imbedding;Bellman;J. Math. Mech.,1959
5. R. Bellman, S. Ueno, and R. Vasudevan, Invariant imbedding and radiation dosimetry. I. Finite order scattering and transmission functions, Math. Biosci. 14 235–254.