by Colvin, L.B., Frahm, L.J., Morrison, J.L.
Published in Poultry science (01.09.1969)

by Frahm, L.J, George, G.M, McDonnell, J.P
Published in J Assoc Off Anal Chem (1975)

by Frahm, L.J, Albrecht, M.E, McDonnell, J.P
Published in J Assoc Off Anal Chem (1975)

by George, G.M, Frahm, L.J, McDonnell, J.P
Published in J Assoc Off Anal Chem (1973)

by George, G.M, Frahm, L.J
Published in Journal of the Association of Official Analytical Chemists (01.09.1986)

by George, G.M, Frahm, L.J, McDonnell, J.P
Published in Journal of the Association of Official Analytical Chemists (01.05.1982)

by George, G M, Frahm, L J, McDonnell, J P
Published in Journal of the Association of Official Analytical Chemists (01.07.1981)