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This research was conducted in part while the author held a National Research Council Postdoctoral Resident Research Associateship supported by the Air Force Systems Command and was also supported in part by the National Science Foundation under Grant No. GP-33652.
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Laetsch, T. Comparison and positivity theorems for linear and nonlinear boundary value problems. J. Anal. Math. 27, 24–46 (1974). https://doi.org/10.1007/BF02788641
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DOI: https://doi.org/10.1007/BF02788641