Syifa Fauzia, Luma Alfiasti Sulton, A. Aulia Asyhari, Ahmad Suryadi, and Fuji Hernawati Kusumah, “Analysis Of Bias And Purity Indices In Packaged Cooking Oil And Bulk Cooking Oil Using The Diffraction Grid Method”, JOUMI, vol. 1, no. 3, pp. 93–101, Sep. 2023.