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This research was supported by the Air Force Office of Scientific Research under Contract AF-AFOSR 496-67 and Grant AF-AFOSR 1244-67B.
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Silverman, L.M., Bucy, R.S. Generalizations of a theorem of doležal. Math. Systems Theory 4, 334–339 (1970). https://doi.org/10.1007/BF01704077
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DOI: https://doi.org/10.1007/BF01704077