B. N. Nguyen Thi, V. H. Chu, T. T. Nguyen, T. N. Nguyen and H. N. Tran, Optimization and Characterization of Paper-based SERS Substrates for Detection of Melamine, Comm. Phys. 30 (2020) 345. DOI: https://doi.org/10.15625/0868-3166/30/0/14832.