5Nascimento ES, J Prodolliet, E Bugner, et al. Determination of synthetic estrogens in illegal veterinary formulations by HPTLC and HPLC. J Chromatogr Sci, 1996, 34 (7) : 330.
6Lanpert BL, M Feinberg, J Richard, et al. Determination of anabolic steroids and zeranol in human serum by isocratic reversed phase HPLC on silica. J Liq Chromatogr, 1989, 12 (16) : 3231.
7WHO. Evaluation of certain veterinary drug residues in food. WHO Technical report series 799, Geneva, 1990. 63.