'Surprised, Shocked, Worried': User Reactions to Facebook Data Collection from Third Parties
P. Arias-Cabarcos, S. Khalili, T. Strufe, Proceedings on Privacy Enhancing Technologies 2023 (2023) 384–399.

Black-Box Accumulation: Collecting Incentives in a Privacy-Preserving Way
T. Jager, A. Rupp, Proceedings on Privacy Enhancing Technologies 2016 (2016) 62–82.