http://www.google.com/notebook/feeds/05770521438663387699/notebooks/BDQ2NQgoQy-XL7ZEj/NDShxQwoQoOPv7ZEj2008-04-05T08:37:46.528Z2008-04-07T22:16:37.352ZarXiv:cond-mat/0104425 v1 23 Apr 2001Thomas