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Dedicated to the memory of my fricad and colle
Work on this paper was done while write was receiving partial support from the U.S. Army Research Office under the grant numbered DAAG 29-76 G 0206 2057-2228.
An erratum to this article is available at http://dx.doi.org/10.1007/BF02803340.
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Leighton, W. Some Sturm theory. J. Anal. Math. 36, 191–197 (1979). https://doi.org/10.1007/BF02798779
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DOI: https://doi.org/10.1007/BF02798779