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Communicated by J. Meixner
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Ar, E., Kleinman, R.E. The exterior Neumann problem for the three-dimensional Helmholtz equation. Arch. Rational Mech. Anal. 23, 218–236 (1966). https://doi.org/10.1007/BF00253158
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DOI: https://doi.org/10.1007/BF00253158