@inbook {2015,
	title = {Die Schaumkellen von Oudmunster in Utrecht. Die Identifikation eines liturgischen Ger{\"a}ts},
	booktitle = {Unitas in pluralitate. Libri ordinarii als Quelle f{\"u}r die Kulturgeschichte. Libri ordinarii as a source for cultural history},
	series = {Liturgiewissenschaftliche Quellen und Forschungen},
	number = {103},
	year = {2015},
	pages = {251-268},
	publisher = {Aschendorff},
	organization = {Aschendorff},
	address = {M{\"u}nster},
	isbn = {9783402112687},
	author = {Staal, Casper},
	editor = {Tongeren, Louis van and Caspers, Charles M.A.}
}
@article {2003,
	title = {De tijd gemarkeerd. Over de relatie tussen tijd en liturgie},
	journal = {Madoc},
	volume = {17},
	year = {2003},
	pages = {223-231},
	author = {Tongeren, Louis van}
}
