@article{SAC-OOPS-J-2009-LievensH13,
	author        = "David Lievens and William Harrison",
	doi           = "10.1016/j.scico.2012.12.007",
	journal       = "{Science of Computer Programming}",
	number        = 7,
	pages         = "953--968",
	title         = "{Abstraction over implementation structure with symmetrically encapsulated multimethods}",
	volume        = 78,
	year          = 2013,
}