N. K. Vân, Đỗ L. Thủy, and T. A. Đức, “Causes and occurring frequency of heavy rain, ‘unusual heavy rain’ in the area from Hai Van Pass to Ca Pass, South - Central Region of Vietnam (period 1986 - 2010)”, Vietnam J. Earth Sci., vol. 35, no. 2, pp. 163–174, Feb. 2014.