Matthew Hague, Roland Meyer, Sebastian Muskalla, Martin Zimmermann 0002. Parity to Safety in Polynomial Time for Pushdown and Collapsible Pushdown Systems. In Igor Potapov, Paul G. Spirakis, James Worrell 0001, editors, 43rd International Symposium on Mathematical Foundations of Computer Science, MFCS 2018, August 27-31, 2018, Liverpool, UK. Volume 117 of LIPIcs, Schloss Dagstuhl - Leibniz-Zentrum fuer Informatik, 2018. [doi]