1. Epidemiology of porcine reproductive and respiratory syndrome (PRRS): an overview;Albina;Vet. Microbiol.,1997
2. Allison, P.D., 1995. Survival Analysis Using the SAS System: A Practical Guide. SAS Institute, Cary, NC, 292 pp.
3. Interaction of Mycoplasma hyopneumoniae and Pasteurella multocida infections in swine;Amass;JAVMA,1994
4. Andreasen, M., 1999. Seroepidemiologiske og eksperimentelle undersøgelser af luftvejslidelser i svinebesætninger. Ph.D. Thesis. The Royal Veterinary and Agricultural University, Federation of Danish Pig Producers and Slaughterhouses, Copenhagen, Denmark, 157 pp.
5. Anonymous, 1994. Rapport over E-kontrollens resultater. Landskontoret for Svin, Rådgivningsservice, Århus, Denmark, Oktober, 11 pp.