Grigoryan, G.R. “DIFFRACTION IMAGE OF PRIMARY NARROW X-RAY BEAM IN WEAKLY DEFORMED CRYSTAL”. Proceedings of the YSU A: Physical and Mathematical Sciences, vol. 46, no. 3 (229), Dec. 2012, pp. 52-55, https://doi.org/10.46991/PYSUA.2012.46.3.052.