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Communicated by G. Strang
Sponsored by the United States Army under Contract No. DA-31-124-ARO-D-462, at Mathematics Research Center, University of Wisconsin, Madison.
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Sarason, L., Smoller, J.A. Geometrical optics and the corner problem. Arch. Rational Mech. Anal. 56, 34–69 (1974). https://doi.org/10.1007/BF00279820
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DOI: https://doi.org/10.1007/BF00279820