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Dedicated to Professor Paul Reece Rider on the occasion of his seventy-sixth birthday.
This research was supported first by NSF grant G-11741 and later by ARO grant DA-ARO(D)-31-124-G197.
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Leighton, W. Morse theory and Liapunov functions. Rend. Circ. Mat. Palermo 13, 229–238 (1964). https://doi.org/10.1007/BF02849531
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DOI: https://doi.org/10.1007/BF02849531