Rosy Dwi Rahmawati, and Sunardi. “Sintesis Dan Karakterisasi Pupuk Lepas Lambat Fe-Zn Dari Limbah Besi, Limbah Seng, Dan Cangkang Telur Ayam”. Journal Serambi Engineering 9, no. 3 (July 9, 2024). Accessed November 29, 2025. https://jurnal.serambimekkah.ac.id/index.php/jse/article/view/1966.