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Science China Physics, Mechanics & Astronomy > 2013 > 56 > 9 > 1627-1631
Physics Letters B > 2010 > 693 > 5 > 609-611
Journal of Geometry and Physics > 2006 > 56 > 4 > 559-570
Science China Physics, Mechanics & Astronomy > 2004 > 47 > 3 > 277-283
Nuclear Physics, Section B > 1998 > 513 > 1-2 > 213-228