Koops, Bert-Jaap, Jaap-Henk Hoepman, and Ronald Leenes. "Open-Source Intelligence and Privacy by Design." Computer Law & Security Review 29 (2013): 676-688.

Koops, Bert-Jaap. "Police investigations in Internet Open Sources: Procedural Law Issues." Computer Law & Security Review 29 (2013): 676-688.