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Mathematische Nachrichten > 283 > 9 > 1336 - 1352
Acta Mathematica Sinica, English Series > 2007 > 23 > 11 > 2003-2016
Mathematische Nachrichten > 283 > 9 > 1336 - 1352
Acta Mathematica Sinica, English Series > 2007 > 23 > 11 > 2003-2016