@article {,
	title = {Some rationality properties of observable groups and related questions},
	journal = {Illinois Journal of Mathematics },
	volume = {49},
	year = {2005},
	pages = {431-444},
	url = {http://projecteuclid.org/euclid.ijm/1258138026},
	author = {Thang, Nguyen Quoc and Bac, Dao Phuong}
}
