Functional Equations, Wave Propagation and Invariant Imbedding
Richard BellmanRobert Kalaba
Indiana University Mathematics Journal
1959
text
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10.1512/iumj.1959.8.58045
10.1512/iumj.1959.8.58045
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Indiana Univ. Math. J. 8 (1959) 683 - 704
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