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Communicated by L. Cesari
Part of this work was done under Contract AF-19(604)-4993, Air Force Cambridge Research Center, ARDC.
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Kazarinoff, N.D., Ritt, R.K. Scalar diffraction theory and turning-point problems. Arch. Rational Mech. Anal. 5, 177–186 (1960). https://doi.org/10.1007/BF00252901
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DOI: https://doi.org/10.1007/BF00252901