Binh, N. T., P. V. Thin, P. T. Nga, and N. A. Tuan. “Random Lasing from a Layer of ZnO Powder Painted on Glass Substrate under Excitation of Nanosecond and Picosecond Laser Pulses”. Communications in Physics, vol. 21, no. 4, Jan. 2012, p. 353, doi:10.15625/0868-3166/21/4/357.