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Journal of Nonlinear Science > 2019 > 29 > 2 > 655-708
Journal of Geometry and Physics > 2017 > 115 > C > 191-217
Journal of Geometry and Physics > 2015 > 87 > Complete > 3-29
Theoretical and Mathematical Physics > 2006 > 146 > 1 > 45-52
Journal of Geometry and Physics > 1995 > 16 > 2 > 168-206