E. S. . Nababan, A. Sihaloho, K. . Husna, and R. . Ilham, “Production Optimization Using Fuzzy Linear programming Method (Case Study: UMKM Untir-untir and Raja Manis Factory) ”, J. of Research in Math. Trends and Tech., vol. 4, no. 2, pp. 15-23, Sep. 2022.