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This research was supported by the U. S. Army Research Office-Durham, Grant DA-ARO-D-31-124-G1151.
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Cima, J.A., Pfaltzgraff, J.A. Oscillatory behavior ofu″(z)+h(z)u(z)=0 for univalenth(z) * . J. Anal. Math. 25, 311–322 (1972). https://doi.org/10.1007/BF02790043
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DOI: https://doi.org/10.1007/BF02790043