OpenURL Button WordPress Plugin

I'd like to download and try out the OpenURL Button plugin for WordPress referenced on the WordPress page. It is described this way:
COinS is often used to refer to some other content than the blog post itself (such as a journal article or book). Peter Binkley maintains another extension, which allows the ability to make COinS entries in the post editor which refer to other references.
Unfortunately I get a 404, and Google doesn't turn up anything, nor does a search in the WordPress plugin directory. Anyone know how I can get this plugin—or one that accomplishes the same thing?

Thanks.

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