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Research of this author supported by NSF Grant GP 5599.
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Grimmer, R.C., Waltman, P. A comparison theorem for a class of nonlinear differential inequalities. Monatshefte für Mathematik 72, 133–136 (1968). https://doi.org/10.1007/BF01298151
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DOI: https://doi.org/10.1007/BF01298151