Geodesic
Variational formulation of diffraction problems
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 30 (1990) no. 6, pp. 910-919 Cet article a éte moissonné depuis la source Math-Net.Ru

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New variational formulations of problem of diffraction of electromagnetic waves by inhomogeneous structures are obtained, which reduce any problem of diffraction in an unbounded domain to the solution of a problem of diffraction in a bounded domain with non-local boundary conditions. The variational formulations obtained can be used in discretization by means of the method of finite elements or finite differences. 
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A. S. Il'inskii; O. M. Maslovskaya. Variational formulation of diffraction problems. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 30 (1990) no. 6, pp. 910-919. http://geodesic.mathdoc.fr/item/ZVMMF_1990_30_6_a9/

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[2] Ilinskii A. S., Chislennye metody issledovaniya zadachi difraktsii na periodicheskikh strukturakh v neodnorodnykh sredakh, Izd-vo MGU, M., 1974

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[5] Pissanetski S., Tekhnologiya razrezhennykh matrits, Mir, M., 1988 | MR