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Journal of Geometry and Physics > 2013 > 73 > Complete > 125-149
Letters in Mathematical Physics > 2012 > 101 > 2 > 157-172
Acta Mathematica Sinica, English Series > 2011 > 27 > 4 > 647-656
Advances in Mathematics > 2009 > 220 > 1 > 1-58
Letters in Mathematical Physics > 2002 > 62 > 1 > 17-32
Letters in Mathematical Physics > 1998 > 43 > 3 > 199-209