@book{1998--stoc
,note={URL: {\tt http://www.acm.org/pubs/contents/proceedings/stoc/276698/}}
,title={{Proceedings of the 30th annual ACM symposium on theory of computing}}
,booktitle={{Proceedings of the 30th annual ACM symposium on theory of computing}}
,ISBN={0--89791--962--9}
,MR={2001d:68026}
,publisher={Association for Computing Machinery}
,year={1998}
}