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Geometric and Functional Analysis > 2013 > 23 > 1 > 334-366
Annals of Physics > 2009 > 324 > 6 > 1219-1233
Physics Letters B > 2007 > 652 > 5-6 > 376-383
Physics Letters B > 2005 > 610 > 1-2 > 107-114
Czechoslovak Journal of Physics > 2005 > 55 > 11 > 1327-1333