Weiland, L., C. Law, and B. Sunjka. “ENSURING SUSTAINABLE AND RESILIENT AIR TRAFFIC MANAGEMENT SYSTEMS FOR SOUTH AFRICA WITH COMPLEXITY AND WHOLE-OF-SOCIETY THEORY APPROACHES”. The South African Journal of Industrial Engineering, vol. 31, no. 3, Nov. 2020, pp. 97-109, doi:10.7166/31-3-2424.