Tuan, N. X., D. V. Trung, N. T. Binh, and B. V. Hai. “Measurements of the Stratospheric Density and Temperature Profiles in Hanoi by a Rayleigh Lidar”. Communications in Physics, vol. 24, no. 3, July 2014, p. 247, doi:10.15625/0868-3166/24/3/3690.