@inbook {1435,
	title = {Polychrome tree grammars (PTGs): a formal presentation},
	booktitle = {Current issues in mathematical linguistics},
	year = {1994},
	publisher = {Elsevier Science B. V.},
	organization = {Elsevier Science B. V.},
	edition = {Martin-Vide, Carlos},
	address = {Amsterdam},
	author = {Cori, Marcel and Jean-Marie Marandin}
}
