use htmltreexpather.pl / xpather.pl / examples(for tree-xpath and others)/walkthroughs/tutorials ...
They'll give you paths you can use to reach [ Paper ID - Title (# Reviewers) ]
Paths like these
/html/body/div[4]/form/dl/dd/p
/html[1]/body[1]/div[4]/form[1]/dl[1]/dd[1]/p[1]
//*[ name() = "form" and position() = 1 and @action = "/openconf/chair
+/assign_reviews.php" and @method = "post" ]
/dl[1]
/dd[1]
/p[1]
These paths are easy to use with HTML::TreeBuilder::XPath or XML::LibXML
They can help you visualize the html even if you choose to stick with TreeBuilder's look_down
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