The complex of interconnected structures of the security services, the opposing organizations and the environment in which they are immersed is a single living organism, building its own ecosystem.
- Goodman, Marc. Future Crimes. Inside the Digital Underground and the Battle for Our Connected World, Penguin Random House, 2016, pp 512
- Radulov, N., Security 4.0. Part One: Security and the Forth Industrial Revolution, Int. sciantific jurnal Industry 4.0, STUME, 2019, 265-267
- Radulov, N., Internet of the things. Security 4.0, Int. sciantific jurnal Security & Future, STUME, 2018, 99-101
- Radulov, N., Artificial Intelligence and Security, Int. sciantific jurnal Security & Future, STUME, 2019, p. 3-5