Wallis, Tania, Chris Johnson, and Mohamed Khamis. "Interorganizational Cooperation in Supply Chain Cybersecurity: A Cross-Industry Study  of the Effectiveness of the UK Implementation of the NIS Directive." Information & Security: An International Journal 48, no. 1 (2021): 36-68.

Wallis, Tania, and Chris Johnson. "Implementing the NIS Directive, Driving Cybersecurity Improvements for Essential Services." In 2020 International Conference on Cyber Situational Awareness, Data Analytics and Assessment (CyberSA). Dublin, 2020.