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References
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Supported in part by the NSF grant DMS-8721813 and the Finnish Academy grant 06/111.
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Bank, S.B., Laine, I. & Langley, J.K. Oscillation results for solutions of linear differential equations in the complex domain. Results. Math. 16, 3–15 (1989). https://doi.org/10.1007/BF03322641
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DOI: https://doi.org/10.1007/BF03322641