1. Verizon.
https://enterprise.verizon.com/resources/reports/2019-data-breach-investigations-report.pdf
. Accessed 7 June 2019
2. Symantec.
https://www.symantec.com/content/dam/symantec/docs/reports/istr-24-2019-en.pdf
. Accessed 7 June 2019
3. Sans.
https://www.sans.org/reading-room/whitepapers/ICS/paper/35502
4. Mark, N., Kelly, M.K.: Critical Capabilities for Security Information and Event, May 2013. Accessed 7 June 2019
5. NSS Labs: NGIPS Test Methodology V4.0.
https://research.nsslabs.com/library/network-security/next-generation-intrusion-prevention-system/