Rahmalia, Dinita, and Awawin Rohmah. “Optimisasi Perencanaan Produksi Pupuk Menggunakan Firefly Algorithm”. Jurnal Matematika "MANTIK" 4, no. 1 (May 11, 2018): 1-6. Accessed May 23, 2019. http://jurnalsaintek.uinsby.ac.id/index.php/mantik/article/view/266.