Original language | English |
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Pages (from-to) | 457-484 |
Number of pages | 28 |
Journal | Journal of Algebra |
Volume | 283 |
Issue number | 2 |
DOIs | |
State | Published - 15 Jan 2005 |
Bibliographical note
Funding Information:* Corresponding author. E-mail address: gychen@swnu.edu.cn (G. Chen). 1 The author is indebted to Fred and Barbara Kort Sino-Israel Postdoctoral Programme for supporting my postdoctoral position at Bar-Ilan University, also to Emmy Noether Mathematics Institute and NSFC for partially financial support.