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Physics Letters A > 2015 > 379 > 26-27 > 1584-1588
Nonlinear Dynamics > 2015 > 81 > 1-2 > 353-371
Open Physics > 2010 > 8 > 4 > 519-522
Open Physics > 2010 > 8 > 4 > 519-522
Central European Journal of Physics > 2010 > 8 > 4 > 519-522