Amadi DN, Budiman A, Utomo P. Analysis of the effectiveness of VPN and PPTP Protocol in E-Link Health Report Application Using NDLC Method. journalisi [Internet]. 2024 Jun. 13 [cited 2026 Mar. 7];6(2):949-58. Available from: https://journal-isi.org/index.php/isi/article/view/746