Agraïments: The second author has been partially supported by Marie Curie grant IEF-234559, and would like to thank the Centre de Recerca Matemàtica, Barcelona, for its hospitality. Finally, the third author is partially supported by NNSF of China grant No. 11271252, by RFDP of Higher Education of China grant No. 20110073110054.
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机译:致谢:第二作者得到了居里夫人授予的IEF-234559的部分支持,并感谢巴塞罗那Center of RecercaMatemàtica的盛情款待。最后,第三作者得到了中国国家自然科学基金会(NNSF)第11271252号赠款,中国高等教育RFDP(20110073110054)的部分支持。
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