1. Biosecurity considerations for pork production units;Amass;J. Swine Health Prod.,1999
2. PADRAP: Production Animal Disease Risk Assessment Program;American Association of Swine Veterinarians (AASV),2011
3. Biosecurity in 116 Danish fattening swineherds: descriptive results and factor analysis;Boklund;Prev. Vet. Med.,2004
4. National Swine Farm-Level Biosecurity Standard;Canadian Swine Health Board (CSHB),2010
5. Biosecurity: a critical review of today's practices;Dee,2003