@inbook {Picard 1983, title = {La liturgie cartusienne, source principale de spiritualit{\'e}. El{\'e}ments de recherches sur les sources de son histoire}, booktitle = {Jan De Grauwe (ed.), Historia et spiritualitas Cartusiensis. Colloquii Quarti Internationalis Acta. Gandavi-Antverpiae-Brugis, 16-19 Sept. 1982}, year = {1983}, pages = {289-301}, address = {Destelbergen}, keywords = {liturgia}, author = {Picard, Jean} }