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S. R. Lehman

Invariant Imbedding, Particle Interaction and Conservation Relations.

1964
Functional equations in the theory of dynamic programming—IX: Variational analysis, analytic continuation, and imbedding of operators

1958
Functional equations in the theory of dynamic programming—X: Resolvents, characteristic functions, and values

1958
A Functional Equation in the Theory of Dynamic Programming and its Generalizations.

1953