@article {Becker:30 August 2001:0168-0072:145,
	author = "Becker H.",
	title = "Topics in invariant descriptive set theory",
	journal = "Annals of Pure and Applied Logic",
	volume = "111",
	year = "30 August 2001",
	abstract = "",
	pages = "145-184(40)",
	url = "http://www.ingentaconnect.com/content/els/01680072/2001/00000111/00000003/art00024"
	doi = "doi:10.1016/S0168-0072(01)00024-0"
}