1. Porcine reproductive and respiratory syndrome;Benfield,1992
2. PRRS: Role of togavirus and other infectious agents in the respiratory disease of pigs;Brun,1994
3. Porcine reproductive and respiratory syndrome: A review;Christianson;Swine Health Prod.,1994
4. Swine infertility and respiratory syndrome (mystery swine disease);Collins,1991
5. Newly recognized respiratory syndrome in North American Swine herds;Collins;Am. Assoc. Swine Pract. News.,1991