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Additional information
Rostov State University. Translated from Funktsional'nyi Analiz i Ego Prilozheniya, Vol. 28, No. 3, pp. 92–94, July–September, 1994.
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Edel'shtein, S.L. On the Helmholtz equation in a strip with penetrable boundary. Funct Anal Its Appl 28, 223–225 (1994). https://doi.org/10.1007/BF01078462
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DOI: https://doi.org/10.1007/BF01078462