@article{LDTA-2003-CostagliolaDFG,
	author        = "Gennaro Costagliola and Vincenzo Deufemia and Filomena Ferrucci and Carmine Gravino",
	doi           = "10.1016/S1571-0661(05)82631-3",
	journal       = "{Electronic Notes in Theoretical Computer Science}",
	number        = 3,
	pages         = "612--627",
	title         = "{Exploiting XPG for Visual Languages: Definition, Analysis and Development}",
	volume        = 82,
	year          = 2003,
}