Kun, Liang, Zhang Lingling, Lu Wei, Cedric Sean Okinda, and Shen Mingxia. 2017. “Optimization of Compression Formulation and Load of Food-Grade Tracers for Grain Traceability Using Central Composite Design”. International Journal of Agricultural and Biological Engineering 10 (6):221-30. https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/3531.