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This research consists partially of the author's Ph.D. dissertation submitted to Rice University. The author wishes to thank Professor B. Frank Jones, Jr., for his help and encouragement, and also the Schlumberger Foundation for financial support.
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Tu, C.C. Non-tangential limits of a solution of a boundary-value problem for the heat equation. Math. Systems Theory 3, 130–138 (1969). https://doi.org/10.1007/BF01746519
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DOI: https://doi.org/10.1007/BF01746519