@article{REER,
	Author = {Gao, Su and Gerdes, Peter M.},
	Journal = {Studia Logica},
	Keywords = {Computably Enumerable Equivalence Relation, equivalence relation, ceer},
	Month = feb,
	Pages = {27-59},
	Title = {Computably Enumerable Equivalence Relations},
	Volume = {67},
	Number = {1},
	Year = {2001},
	Abstract = {We study computably enumerable equivalence relations (ceers) on N and unravel a rich structural theory for a strong notion of reducibility among ceers.},
	Url = {http://invariant.org/math.html}
}