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This research is a part of Ph.D. thesis in the University of Nottingham, supervised by Dr. J. K. Langley.
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Elzaidi, S.M. On the oscillation of solutions of certain differential equations. Results. Math. 32, 291–297 (1997). https://doi.org/10.1007/BF03322140
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DOI: https://doi.org/10.1007/BF03322140