Ebrahimi, Fazel Hajizadeh, and Dinh Tran Ngoc Huy. 2018. “Tax Rates Effects on the Risk Level of Listed Viet Nam Construction Material Firms During Global Economic Crisis 2007-2009”. International Academic Journal of Science and Engineering 5 (1): 34-48. https://doi.org/10.9756/IAJSE/V5I1/1810004.