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Theoretical and Mathematical Physics > 2014 > 180 > 3 > 1096-1129
Mathematical Notes > 2014 > 95 > 1-2 > 91-97
Mathematical Notes > 2014 > 95 > 3-4 > 399-406
Mathematical Notes > 2014 > 96 > 1-2 > 50-67
Mathematical Notes > 2014 > 96 > 3-4 > 403-415
Mathematical Notes > 2014 > 95 > 5-6 > 670-685