Fitri, F., M. W. Ketrin, and M. Almuhayar. “MODELING TOTAL FERTILITY RATE IN INDONESIA: A COMPARISON OF FOURIER SERIES REGRESSION AND ELASTIC NET REGRESSION”. BAREKENG: Jurnal Ilmu Matematika Dan Terapan, Vol. 19, no. 3, July 2025, pp. 2017-28, doi:10.30598/barekengvol19iss3pp2017-2028.