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<ref name="Jeff">http://www.jeffgalloway.com/training/marathon.html</ref>
<ref name="Hal">http://www.halhigdon.com/marathon/advanced2/advancedII.htm</ref>
<ref name="RW">[http://www.runnersworld.com/article/0,7120,s6-238-244--6946-2-3X5X7-4,00.html</ref>
</references>
