T. T. H. Le, D. H. Truong, T. L. A. Nguyen, Pham Minh Quan, T. C. Ngo, and D. Duy Quang, “SERS chemical enhancement of 2,4,5-trichlorophenoxyacetic acid absorbed on Au20, its Au-Ag and Au-Cu bimetallic clusters: a DFT study”, Vietnam J. Sci. Technol., vol. 60, no. 4, pp. 641–651, Mar. 2022.