T. Hoffmann

U.S. Food and Drug Administration pesticide program: incidence/level monitoring of domestic and imported pears and tomatoes.

N. Yess, J. I. Roberts, R. H. Albert, 1995, Journal of AOAC International.

Differentiation of Avian Poxvirus Strains on the Basis of Nucleotide Sequences of 4b Gene Fragment

H. Hafez, D. Lüschow, H. Hafez, 2004, Avian diseases.