@inproceedings{STOC-1998-AjtaiFS,
	author        = "Miklós Ajtai and Ronald Fagin and Larry J. Stockmeyer",
	booktitle     = "{Proceedings of the 30th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/276698.276771",
	isbn          = "0-89791-962-9",
	pages         = "309--318",
	publisher     = "{ACM}",
	title         = "{The Closure of Monadic NP}",
	year          = 1998,
}