SETYADI, Heribertus Ary; SUPRIYANTA, Supriyanta; NUROHIM, Galih Setiawan. Improving Junk Sale and Purchase Transactions Using a Spiral Model-Based System. Journal of Information Systems and Informatics, [S. l.], v. 6, n. 4, p. 2237–2254, 2024. DOI: 10.51519/journalisi.v6i4.871. Disponível em: https://www.journal-isi.org/index.php/isi/article/view/871. Acesso em: 7 mar. 2026.