K. Mokgohloa, G. Kanakana-Katumba, and R. Maladzhi "Development of a Technology and Digital Transformation Adoption Framework of the Postal Industry in Southern Africa: From Critical Literature Review to a Theoretical Framework", Advances in Science, Technology and Engineering Systems Journal, vol. 5, no. 6, pp. 1190–1206, 2020, doi: 10.25046/aj0506143.