L. M. A. Hameed, H. W. Abdulrahman, and I. M. Alwan, “A comparison of some forecasting models to forecast the number of old people in Iraqi retirement homes”, Period. Eng. Nat. Sci., vol. 8, no. 3, pp. 1525–1534, Aug. 2020, doi: 10.21533/pen.v8.i3.1192.