Balachandra, and Prema K.V. “Certificate Path Verification in Hierarchical and Peer-to-Peer Public Key Infrastructures”. Journal of Technology Management for Growing Economies 1, no. 1 (April 26, 2010): 77–92. Accessed September 23, 2021. https://tmg.chitkara.edu.in/index.php/tmge/article/view/118.