Статья 8046 H. L. Margaryan V. K. Abrahamyan D. L. Hovhannisyan N. H. Hakobyan V. M. Aroutiounian V. V. Belyaev A. S. Solomatin Journal of Contemporary Physics (Armenian Academy of Sciences) 3, vol.52 258–263 2017 https://link.springer.com/article/10.3103/S1068337217030112