“Designing the Reverse Logistics of Newspaper Collection from Household by a Paper Recycling Unit: A Linear Programming Model”. iJournals:International Journal of Software & Hardware Research in Engineering ISSN:2347-4890 10, no. 8 (Agustus 31, 2022). Diakses Oktober 22, 2026. https://ijournals.in/journal/index.php/ijshre/article/view/170.