9Abraham A, Sivanandan V, Halvorson A, et al. Standardization of enzyme-linked immunosorbent assay for avian influenza virus antibodies in turkeys[J]. Am J Vet Res, 1986, 47:561566.
10Kodihalli S, Stivanandan V, Nagaraja V, et al. Antigen-capture enzyme immunoassay for detection of avian influenza virus in turkeys[J]. Am J Vet Res, 1993, 54:1385-1390.