Ngoc Huy, D. T. “IMPACTS OF EXTERNAL FINANCING ON THE RISK LEVEL OF VIET NAM NATURAL GAS AND OIL INDUSTRY DURING AND AFTER THE GLOBAL CRISIS 2007-2009”. International Journal of Research -GRANTHAALAYAH, vol. 3, no. 9, Sept. 2015, pp. 49-62, doi:10.29121/granthaalayah.v3.i9.2015.2945.