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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