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Technical Physics > 2019 > 64 > 9 > 1237-1241
Moscow University Physics Bulletin > 2019 > 74 > 1 > 17-23
Open Physics > 2013 > 11 > 6 > 676-684
Open Physics > 2013 > 11 > 6 > 676-684
Central European Journal of Physics > 2013 > 11 > 6 > 676-684
Moscow University Physics Bulletin > 2010 > 65 > 2 > 150-151
Theoretical and Mathematical Physics > 2009 > 158 > 3 > 355-359