Damasco Jr., Loreto B., Noel Raymund F. Lacson, and Roger T. Intong. “Safeguarding Transactional Data: A Comprehensive Investigation of VPN Integration in Point-of-Sale Systems for Enhanced Security and Connectivity”. Eximia 12, no. 1 (December 14, 2023): 570–589. Accessed June 8, 2026. https://www.eximiajournal.techniumscience.pluscommunication.eu/index.php/eximia/article/view/405.