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LibreCat: https://research-explorer.ista.ac.at/record/1609
DOI: 10.1007/978-3-662-47666-6_9

Chatterjee, K., Henzinger, T. A., Ibsen-Jensen, R., &; Otop, J. (2015). Edit distance for pushdown automata. In 42nd International Colloquium (Vol. 9135, pp. 121–133). Kyoto, Japan: Springer Nature.https://doi.org/10.1007/978-3-662-47666-6_10 
LibreCat: https://research-explorer.ista.ac.at/record/1610
DOI: 10.1007/978-3-662-47666-6_10
arXiv: 1504.08259