@inproceedings{POPL-2016-HagueKO,
	author        = "Matthew Hague and Jonathan Kochems and C.-H. Luke Ong",
	booktitle     = "{Proceedings of the 43rd Symposium on Principles of Programming Languages}",
	doi           = "10.1145/2837614.2837627",
	isbn          = "978-1-4503-3549-2",
	pages         = "151--163",
	publisher     = "{ACM}",
	title         = "{Unboundedness and downward closures of higher-order pushdown automata}",
	year          = 2016,
}