Geodesic
Diffraction of spherical X-ray waves in bicrystal interferometer. I. Rotational moire
Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1985), pp. 74-79.

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The problem of diffraction of an incident spherical X-ray wave in a two-crystal interferometer with a narrow air gap is considered for the asymmetric Laue case in the presence of a small mutual rotation of the blocks. 
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     author = {V. S. Harutyunyan},
     title = {Diffraction of spherical {X-ray} waves in bicrystal interferometer. {I.} {Rotational} moire},
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V. S. Harutyunyan. Diffraction of spherical X-ray waves in bicrystal interferometer. I. Rotational moire. Proceedings of the Yerevan State University. Physical and mathematical sciences, no. 2 (1985), pp. 74-79. http://geodesic.mathdoc.fr/item/UZERU_1985_2_a12/

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