Ul Haq, H. B., A. Abbas, R. Khan, A. Akhtar, W. Akram, S. Nawaz, F. Mayo, and A. Bhatti. “E-Healthcare Using Block Chain Technology and Cryptographic Techniques: A Review”. Pakistan Journal of Engineering and Technology, Vol. 5, no. 4, Dec. 2022, pp. 21-28, doi:10.51846/vol5iss4pp21-28.