Hong, P. Y., Li, X. Z., Yang, X., Shinkai, T., Zhang, Y., Wang, X., Mackie, R. I. (2012). Monitoring airborne biotic contaminants in the indoor environment of pig and poultry confinement buildings, Environ. Microbiol., 14 (6), 1420-1431, 10.1111/j.1462-2920.2012.02726.x