K. N. Minh, C. T. Anh, L. T. Q. Ngan, L. V. Vu and D. T. Cao, Synthesis of Flower-like Silver Nanostructures on Silicon and Their Application in Surface-enhanced Raman Scattering, Comm. Phys. 26 (2017) 241. DOI: https://doi.org/10.15625/0868-3166/26/3/9023.