ARGA PRADANA; SUPRIANTO. Building a Website Based Gemstone Authenticity Certificate Information System: Membangun Sistem Informasi Sertifikat Keaslian Batu Permata Berbasis Website. Procedia of Engineering and Life Science, [S. l.], v. 1, n. 2, 2021. DOI: 10.21070/pels.v1i2.967. Disponível em: https://pels.umsida.ac.id/index.php/PELS/article/view/967. Acesso em: 27 jun. 2025.