@inproceedings{LOPSTR-2003-BerghammerM,
	author        = "Rudolf Berghammer and Markus Müller-Olm",
	booktitle     = "{Revised Selected Papers of the 13th International Symposium on Logic Based Program Synthesis and Transformation}",
	doi           = "10.1007/978-3-540-25938-1_6",
	isbn          = "3-540-22174-3",
	pages         = "59--74",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Formal Development and Verification of Approximation Algorithms Using Auxiliary Variables}",
	volume        = 3018,
	year          = 2003,
}