@article{Friant:1969,
	key = "Friant 1969",
	author = "J. Friant",
	title = "Grammaires {g\'en\'eratives} pour l'ensemble
des nombres premiers",
	journal = RRMPA,
	volume = 14,
	year = 1969,
	pages = "473-488"}

@article{Marcus:1964,
	key = "Marcus 1964",
	author = "S. Marcus",
	title = "Sur un {mod\`ele} de {H. B. Curry} pour le
langage {math\'ematique}",
	journal = CRASP,
	volume = 258,
	year = 1964,
	pages = "1954-1956"}