The "document" referred to herein is the collection of bibtex citations presented in this collection. Specifically, this license covers only this collection of bibtex citations. Referenced items themselves (the actual articles, books, etc.) may have their own licenses and copyrights, and are not covered by this license.
Copyright (c) 2001-2008 by Jun Wang and Les Gasser. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts.
A copy of the license can be found here: "GNU Free Documentation License".