Modeling the trend of Iraqi GDP for 1970-2020. Periodicals of Engineering and Natural Sciences, [S. l.], v. 11, n. 1, p. 216–222, 2025. DOI: 10.21533/pen.v11.i1.91. Disponível em: https://pen.ius.edu.ba/index.php/pen/article/view/91. Acesso em: 31 may. 2026.