On a not so sad note - writing a high performance fully async spider is a trivial task so it is just a matter of guessing the urls
http://www.jstor.org/stable/i40055831 - this seems to be the issue format just regex for them
there the articles url are in
http://www.jstor.org/stable/41237135 this format. So parse any page for those links and keep already crawled and html downloaded.