"Chemical Identification by Sub-Nanometer Resolved Single-Molecule Raman Scattering" Yao Zhang, et al., in Recent Developments In Plasmon-supported Raman Spectroscopy: 45 Years Of Enhanced Raman Signals, edited by Katrin Kneipp, Yukihiro Ozaki, and Zhong-Qun Tian. New Jersey: World Scientific, 2017, pp.361-399.