N. X. Tuan, D. V. Trung, N. T. Binh and B. V. Hai, Measurements of the stratospheric Density and Temperature Profiles in Hanoi by a Rayleigh Lidar, Comm. Phys. 24 (2014) 247. DOI: https://doi.org/10.15625/0868-3166/24/3/3690.