β€œAN APPLICATION OF TIME INDEPENDENT FOURIER AMPLITUDE MODEL ON FORECASTING THE UNITED STATE POPULATION ”. FUDMA JOURNAL OF SCIENCES 6, no. 1 (March 31, 2022): 54–59. Accessed September 11, 2025. http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/881.