There is also more information in this thread http://www.netbuilders.org/site-seo/...ing-15706.html
It is not possible to maintain the value of PR, without going to build backlinks to your website. This is due to the fact that you can not manage the value of PR, which get backlinks in order to continue to build back from time to time, maybe get a bunch of high PR reversed once a week to increase the value of PR.
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