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Journal of Mathematical Analysis and Applications > 2017 > 454 > 2 > 468-480
Journal of Geometry and Physics > 2014 > 85 > Complete > 40-45
Physics Letters A > 2012 > 376 > 28-29 > 2015-2022
Acta Applicandae Mathematicae > 2008 > 102 > 2-3 > 147-178
Applied Mathematics Letters > 2000 > 13 > 6 > 45-48