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Communicated by M. M. Schiffer
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Ikebe, T. Orthogonality of the eigenfunctions for the exterior problem connected with -Δ. Arch. Rational Mech. Anal. 19, 71–73 (1965). https://doi.org/10.1007/BF00252279
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DOI: https://doi.org/10.1007/BF00252279