| Original language | English |
|---|---|
| Pages (from-to) | 345-355 |
| Number of pages | 11 |
| Journal | Journal of Algebra |
| Volume | 219 |
| Issue number | 1 |
| DOIs | |
| State | Published - 1 Sep 1999 |
Bibliographical note
Funding Information:*The authors acknowledge the hospitality of Mathematisches Forschungsinstitut Oberwol-fach, at which some of this work was carried out. The fourth author also acknowledges support from the Israel Science Foundation.