Gian, Yohanes, et al. “Modeling Monthly Internet Data Package Expenditures Using the Numerical Method of Inverse Matrices”. EduMatSains : Jurnal Pendidikan, Matematika Dan Sains, vol. 11, no. 2, Oct. 2026, pp. 387-9, doi:10.33541/edumatsains.v11i2.7790.