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The research of L. Weiss was supported in part by the Air Force Office of Scientific Research, Office of Aerospace Research, U.S. Air Force, under AFOSR Grants 68-1346 and 69-1646, and in part by the Alfred P. Sloan Foundation in the form of a research fellowship.
The research of P. L. Falb was supported in part by the National Science Foundation under Grant GK-967 and in part by the Air Force Office of Scientific Research, Office of Aerospace Research, U.S. Air Force, under AFOSR Grant 693-66.
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Weiss, L., Falb, P.L. Doležal's theorem, linear algebra with continuously parametrized elements, and time-varying systems. Math. Systems Theory 3, 67–75 (1969). https://doi.org/10.1007/BF01695627
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DOI: https://doi.org/10.1007/BF01695627