@article{LDTA-J-2011-JohnstoneSB,
	author        = "Adrian Johnstone and Elizabeth Scott and Mark van den Brand",
	doi           = "10.1016/j.scico.2013.09.012",
	editor        = "Claus Brabrand and Eric Van Wyk",
	journal       = "{Science of Computer Programming}",
	pages         = "23--43",
	title         = "{Modular grammar specification}",
	volume        = 87,
	year          = 2014,
}