基金The project supported by National Natural Science Foundation of China under Grant Nos. 90103019, 10375003 and 10421503, the Doctoral Program Foundation of Institution of Higher Education under Grant No. KJCX2-SW-N10. S.L. Zhu thanks B.A. Li for very helpful criticism and N. Kochelev and X.G. He for useful discussions.
基金National Natural Science Foundation of China(10705001)Foundation for the Author of National Excellent Doctoral Dissertation of China(200924)+1 种基金Doctoral Program Foundation of Institutions of Higher Education China(20090211120029)Program for New Century Excellent Talentsin University by Ministry of Education of China(NCET-10-0442)~~