Sudarma, M., and J. Sulaksono. “Implementation of TF-IDF Algorithm to Detect Human Eye Factors Affecting the Health Service System”. INTENSIF: Jurnal Ilmiah Penelitian Dan Penerapan Teknologi Sistem Informasi, vol. 4, no. 1, Feb. 2020, pp. 123-30, doi:10.29407/intensif.v4i1.13858.