@inproceedings{LICS-2007-Nguyen,
	author        = "Phuong Nguyen",
	booktitle     = "{Proceedings of the 22nd IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2007.42",
	isbn          = "0-7695-2908-9",
	pages         = "235--244",
	publisher     = "{IEEE Computer Society}",
	title         = "{Separating DAG-Like and Tree-Like Proof Systems}",
	year          = 2007,
}