@inproceedings{GTTSE-2011-ErwigW,
	author        = "Martin Erwig and Eric Walkingshaw",
	booktitle     = "{Revised Papers of the Fourth International Summer School on Generative and Transformational Techniques in Software Engineering}",
	doi           = "10.1007/978-3-642-35992-7_2",
	editor        = "Ralf Lämmel and João Saraiva and Joost Visser",
	isbn          = "['978-3-642-35991-0', '978-3-642-35992-7']",
	pages         = "55--100",
	publisher     = "{Springer International Publishing}",
	series        = "{Lecture Notes in Computer Science}",
	title         = "{Variation Programming with the Choice Calculus}",
	volume        = 7680,
	year          = 2011,
}