FITRI, F.; KETRIN, M. W.; ALMUHAYAR, M. MODELING TOTAL FERTILITY RATE IN INDONESIA: A COMPARISON OF FOURIER SERIES REGRESSION AND ELASTIC NET REGRESSION. BAREKENG: Jurnal Ilmu Matematika dan Terapan, v. 19, n. 3, p. 2017-2028, 1 jul. 2025.