Chen, Ke, Metcalfe, Sarah E., Yu, Huan, Xu, Jingsha, Xu, Honghui, Ji, Dongsheng, Wang, Chengjun, Xiao, Hang, He, Jun, "Characteristics and source attribution of PM₂.₅ during 2016 G20 Summit in Hangzhou: Efficacy of radical measures to reduce source emissions", Journal of environmental sciences (China), 2021