@inbook {Op de Coul 2015b,
	title = {The life of a fifteenth-century Carthusian gradual from Roermond},
	booktitle = {Tom Gaens \& Francis Timmermans (eds.), Tradition et transformation. Les chartreux dans l{\textquoteright}Europe m{\'e}di{\'e}vale et moderne. Colloque international {\`a} l{\textquoteright}occasion du 650e anniversaire de la fondation de la chartreuse de Li{\`e}ge (6-8 octobre 2010)},
	series = {Analecta Cartusiana},
	number = {306},
	year = {2015},
	pages = {219-250},
	address = {Saint-{\'E}tienne},
	keywords = {gradualia, Parkminster O.Cart. (ms. bb.6 [A.6]), Roermond O. Cart. (ms. Parkminster St. Hugh{\textquoteright}s Charterhouse), Roermond O.Cart.: Graduale (ms. Parkminster St. Hugh{\textquoteright}s  Charterhouse)},
	author = {Op de Coul, Thomas}
}
