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Physica D: Nonlinear Phenomena > 2012 > 241 > 16 > 1291-1305
Journal of Geometry and Physics > 2008 > 58 > 8 > 931-941
Journal of Functional Analysis > 2008 > 255 > 1 > 228-254
Reports on Mathematical Physics > 2001 > 47 > 1 > 9-20