Grigor’eva, N. S. Estimation of the field in the shadow zone for diffraction of a spherical wave by a convex, infinitely differentiable surface. (English) Zbl 0401.35024 J. Sov. Math. 11, 424-441 (1979). MSC: 35J05 35B99 35B45 PDF BibTeX XML Cite \textit{N. S. Grigor'eva}, J. Sov. Math. 11, 424--441 (1979; Zbl 0401.35024) Full Text: DOI OpenURL
Babich, V. M.; Grigor’eva, N. S. Asymptotic properties of solutions to some three-dimensional wave problems. (English) Zbl 0401.35023 J. Sov. Math. 11, 372-413 (1979). MSC: 35J05 35B40 PDF BibTeX XML Cite \textit{V. M. Babich} and \textit{N. S. Grigor'eva}, J. Sov. Math. 11, 372--413 (1979; Zbl 0401.35023) Full Text: DOI OpenURL
Grigor’eva, N. S. Ursell’s approach to obtaining an a priori estimate for the solution of the Neumann problem for the Helmholtz equation. (English) Zbl 0396.35005 J. Sov. Math. 9, 479-543 (1978). MSC: 35B45 35J10 35A08 PDF BibTeX XML Cite \textit{N. S. Grigor'eva}, J. Sov. Math. 9, 479--543 (1978; Zbl 0396.35005) Full Text: DOI OpenURL