Tianjia Guan, Maosheng Yao, Junxia Wang, Yanhua Fang, Songhe Hu, Yan Wang, Anindita Dutta, Junnan Yang, Yusheng Wu, Min Hu, Tong Zhu* (2014), Airborne endotoxin in fine particulate matter in Beijing, Atmospheric Environment, 97:35–42.