@InProceedings{parys:LIPIcs.STACS.2012.54,
author = {Parys, Pawel},
title = {{A Pumping Lemma for Pushdown Graphs of Any Level}},
booktitle = {29th International Symposium on Theoretical Aspects of Computer Science (STACS 2012)},
pages = {54--65},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-939897-35-4},
ISSN = {1868-8969},
year = {2012},
volume = {14},
editor = {D\"{u}rr, Christoph and Wilke, Thomas},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.STACS.2012.54},
URN = {urn:nbn:de:0030-drops-33940},
doi = {10.4230/LIPIcs.STACS.2012.54},
annote = {Keywords: pushdown graph, epsilon-contraction, pumping lemma}
}