@inproceedings{PPDP-2006-YuseI,
	author        = "Yosihiro Yuse and Atsushi Igarashi",
	booktitle     = "{Proceedings of the Eighth International Conference on Principles and Practice of Declarative Programming}",
	doi           = "10.1145/1140335.1140360",
	isbn          = "1-59593-388-3",
	pages         = "201--212",
	publisher     = "{ACM}",
	title         = "{A modal type system for multi-level generating extensions with persistent code}",
	year          = 2006,
}