Original language | English |
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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.