Russell, P. H., B. McRandle, D. O’Brien, and J. Hau. “Immunoglobulin A in Chickens. Comparison 0ft0ta1 and immune—specific Lacrimal and Serum IgA Levels in Two Lines of Chickens Immunized With Newcastle Disease Virus”. Scandinavian Journal of Laboratory Animal Science, vol. 20, no. 3, Dec. 1993, doi:10.23675/sjlas.v20i3.736.