@article {2009,
	title = {Medieval letters and letter collections as historical sources: methodological questions and reflections and research perspectives (6th-14th centuries)},
	journal = {Studi Medievali},
	volume = {50},
	year = {2009},
	pages = {41-73},
	author = {Ysebaert, Walter}
}
@article {2006,
	title = {Cinq lettres inconnues d{\textquoteright}Etienne de Tournai},
	journal = {Sacris Erudiri},
	volume = {45},
	year = {2006},
	pages = {353-378},
	author = {Ysebaert, Walter}
}
@article {20058,
	title = {Medieval Letter-Collections as a Mirror of Circles of Friendship? The Example of Stephen of Tournai. 1128-1203},
	journal = {Belgisch Tijdschrift voor Filologie en Geschiedenis},
	volume = {83},
	year = {2005},
	pages = {285-300},
	author = {Ysebaert, Walter}
}
