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Theoretical and Mathematical Physics > 2015 > 182 > 2 > 308-310
Mathematical Notes > 2014 > 96 > 1-2 > 50-67
Mathematical Notes > 2014 > 96 > 3-4 > 403-415
Theoretical and Mathematical Physics > 2015 > 182 > 2 > 308-310
Mathematical Notes > 2014 > 96 > 1-2 > 50-67
Mathematical Notes > 2014 > 96 > 3-4 > 403-415