@inbook {Becker 2003, title = {Bruno von K{\"o}ln und die Liturgie der Kartause}, booktitle = {Francis Timmermans \& Tom Gaens (eds.), Magister Bruno. Negen eeuwen uitstraling van de Kartuizerorde}, year = {2003}, pages = {1-7}, address = {Leuven}, keywords = {liturgia}, author = {Becker, Hansjakob} }