@conference {DBLP:conf/agp/BrogiRT94,
	title = {Amalgamating Language and Meta-language for Composing Logic Programs},
	booktitle = {GULP-PRODE (2)},
	year = {1994},
	pages = {408-422},
	author = {Antonio Brogi and Chiara Renso and Franco Turini}
}
