Boutayeb Nasser, Ghemima Mostefa. “The Role of Investment Spending in Boosting Non-Hydrocarbon GDP An Econometric Study for the Period 2000/2023”. European Economic Letters (EEL), vol. 15, no. 1, Mar. 2025, pp. 3058-71, https://eelet.org.uk/index.php/journal/article/view/2703.