Ussatova, O., S. Makilenov, A. Mukaddas, S. Amanzholova, Y. Begimbayeva, and N. Ussatov. “Enhancing Healthcare Data Security: A Two-Step Authentication Scheme With Cloud Technology and Blockchain”. Eastern-European Journal of Enterprise Technologies, vol. 6, no. 2 (126), Dec. 2023, pp. 6-16, doi:10.15587/1729-4061.2023.289325.