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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1956 Sep;42(9):629–632. doi: 10.1073/pnas.42.9.629

ON THE PRINCIPLE OF INVARIANT IMBEDDING AND PROPAGATION THROUGH INHOMOGENEOUS MEDIA

Richard Bellman 1, Robert Kalaba 1
PMCID: PMC534265  PMID: 16589920

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