C. A. Tuan, N. T. T. Trang, L. A. Tu, D. T. Giang, P. H. Duong, and P. T. Huy, “Optical Properties of Silicon Nanoparticles Prepared by Laser Ablation Method in Various Media”, Comm. Phys., vol. 24, no. 3S1, pp. 143–148, Nov. 2014.