Nurrizky, Hafiz Aulia, et al. “Formula Optimization and Characterization of Soybeans and Pearl Millet (Penisetum Glaucum) Tempeh Using Simplex Lattice Design Methods”. Indonesian Food Science and Technology Journal, vol. 8, no. 2, July 2025, pp. 229-35, doi:10.22437/ifstj.v8i2.37488.