The non-self-conjugate singular spectral problem for a Helmholtz operator with discontinuous coefficients
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 32 (1992) no. 4, pp. 587-597 Cet article a éte moissonné depuis la source Math-Net.Ru

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     title = {The non-self-conjugate singular spectral problem for a {Helmholtz} operator with discontinuous coefficients},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
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G. V. Alekseev; E. G. Komarov. The non-self-conjugate singular spectral problem for a Helmholtz operator with discontinuous coefficients. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 32 (1992) no. 4, pp. 587-597. http://geodesic.mathdoc.fr/item/ZVMMF_1992_32_4_a7/

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