Original language | English |
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Pages (from-to) | 301-321 |
Number of pages | 21 |
Journal | Topology |
Volume | 38 |
Issue number | 2 |
DOIs | |
State | Published - Mar 1999 |
Bibliographical note
Funding Information:sPartially supported by the Alon fellowship, the Alfred P. Sloan fellowship and NSF grants DMS-9402988 and DMS-9703756.