<sect1 id="prog-links" xreflabel="Links">
    <title>Links</title>

    <itemizedlist>
    <listitem><para>
    <ulink
    url="http://www.postgresql.org/">PostgreSQL</ulink>
    -- The official PostgreSQL web site.
    </para></listitem>
    <listitem><para>
    <ulink
    url="http://www.sai.msu.su/~megera/postgres/gist/">GiST support in PostgreSQL</ulink>
    -- Information and patches for the GiST implementation in PostgreSQL.
    </para></listitem>
    <listitem><para>
    <ulink
    url="http://gist.cs.berkeley.edu/">The GiST Indexing Project</ulink>
    -- The GiST project at the University of California, Berkeley. Studies the engineering and mathematics behind content-based indexing for massive amounts of complex content.
    </para></listitem>
    <listitem><para>
    <ulink
    url="http://snowball.sourceforge.net/">Snowball</ulink>
    -- A language in which stemmers can be exactly defined, and from which fast stemmer programs in ANSI C or Java can be generated. A range of stemmers is presented in parallel algorithmic and Snowball form, including the original Porter stemmer for English.
    </para></listitem>
    <listitem><para>
    <ulink
    url="http://www.xapian.org">Xapian</ulink>
    -- A library that enables developers to use advanced information retrieval techniques in their own search engine projects. Xapian includes implementations of Porter's Stemming Algorithm in many languages including Danish, Dutch, English, French, German, Italian, Norwegian, Portuguese, Spanish, and Swedish.
    </para></listitem>
    </itemizedlist>



</sect1>
