id: 70171614 dt: a an: 70171614 au: Van Staden, Wynand; Olivier, Martin S. ti: Using purpose lattices to facilitate customisation of privacy agreements so: TrustBus, 201-209 (2007). py: 2007 pu: la: EN cc: ut: ci: li: doi:10.1007/978-3-540-74409-2_22