N. T. T. Thuy, N. T. Dung, K. Sekiguchi, R. Yamaguchi, P. C. Thuy, and H. Q. Bang, “Characteristics of elemental and organic carbon in atmospheric nanoparticles at different sampling locations in Vietnam”, Vietnam J. Sci. Technol., vol. 55, no. 3, pp. 305–315, Jun. 2017.