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The research reported in this paper was supported in part by the National Aeronautics and Space Administration under research grant NsG-381 and in part by a stipendiary grant from Brown Engineering Company while the author was affiliated with the University of Alabama Research Institute.
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Bridgland, T.F. A criterion for weak controllability. Math. Systems Theory 2, 51–56 (1968). https://doi.org/10.1007/BF01691345
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DOI: https://doi.org/10.1007/BF01691345