Phuong, N. T. T., D. T. N. Huy, L. N. Nuong, and N. T. Thuy. “An Expansion Analysis of Risk Level of Viet Nam Construction Material Industry under Financial Leverage During and After the Global Crisis 2007-2009”. Current Strategies in Economics and Management Vol. 1, June 2020, pp. 96-09, https://stm1.bookpi.org/index.php/csem-v1/article/view/1382.