2Bernard S,,Lantier I,Laude H,et al.Detection of transmissiblegastroenteritis coronavirus antigens by a sandwich enzyme-linked immunosorhent assay technique. American Journal of Veterinary Research . 1986
3Gillian D Lewis,Angela Hough,David H Green,et al.Modification of the polyethylene glycol6000precipitation method for recove-ring human and indicator viruses from oysters and mussels. New Zealand Journal of Marine and Freshwater Research . 1996
4Leman AD,Straw B,Glock RD,et al.Disease of Swine. . 1992