Identification method of bus exposure risk under public health emergencies: taking Shenzhen's fight against COVID-19 as an example
JI Xiaofeng, WU Yaxin, MAO Runcai, ZHANG Qi
China Safety Science Journal . 2021, (2): 89 -98 .  DOI: 10.16265/j.cnki.issn 1003-3033.2021.02.013