1. BSI.
https://www.bsi.bund.de/DE/Presse/Pressemitteilungen/Presse2018/Cyber-Angriffe_haben_erhebliche_Konsequenzen_fuer_die_Wirtschaft_31012018.html
. Accessed 26 Nov 2018
2. Moallem, A.: Human-Computer Interaction and Cybersecurity Handbook, pp. 18–19. CRC Press, Boca Raton (2019)
3. IEC.
https://www.iec.ch/functionalsafety/explained/page1.htm
. Accessed 23 Jan 2019
4. IEC.
https://www.iec.ch/functionalsafety/standards/page2.htm
. Accessed 23 Jan 2019
5. IEC.
https://webstore.iec.ch/publication/61289
. Accessed 23 Jan 2019