Dinev, Yavor. "Legal Considerations of Intelligence Operations in Countering Transnational Organised Crime." Information & Security: An International Journal 31 (2014): 07-47.

Mednikarov, Bojan, and Kiril Kolev. "Terrorism on the Sea, Piracy, and Maritime Security." Information & Security: An International Journal 19 (2006): 102-114.