Alexander Kartzow. A Pumping Lemma for Collapsible Pushdown Graphs of Level 2. In Marc Bezem, editor, Computer Science Logic, 25th International Workshop / 20th Annual Conference of the EACSL, CSL 2011, September 12-15, 2011, Bergen, Norway, Proceedings. Volume 12 of LIPIcs, pages 322-336, Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik, 2011. [doi]
Abstract is missing.