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Additional information
Section of Applied Physics Problems, Armenian Academy of Sciences. Translated from Astrofizika, Vol. 20, No. 3, pp. 607–614, May–June, 1984.
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Mkrtchyan, A.R., Gabrielyan, R.G. Application of the invariance principle to problems of gamma radiation transfer in crystals. Astrophysics 20, 340–344 (1984). https://doi.org/10.1007/BF01005425
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DOI: https://doi.org/10.1007/BF01005425