Lei, Zhou, 		YX, Feng, 		WD, Zhang, AND 		HJ, Yu.
"Interventions and Respiratory Specimen Screening of Close Contacts to Control an Outbreak of Pandemic Influenza A (H1N1) Virus in a Tour Group, China, 2009" <em>OSIR Journal</em> [Online], Volume 3 Number 2 (20 November 2016)