4De RuyckH, De Ridder H. Determination of tetracycline antibiotics in cow's milk by liquid chromatography/tandem mass spectrometry [J].Rapid Commun Mass Spectrom, 2007, 21: 1511-1520.
5Ghidini S, Zanardi E , Varisco G, et al. Prevalence of molecules of β-lactam antibiotics in bovine milk in Lombardia and Emilia Romagna(Italy) [J]. Ann Fac Medic Parma, 2002, 22: 245-252.