Development of a diphasic dialysis method for the extraction/purification of residues of ethinylestradiol in hair of cattle, and determination by gas chromatography-tandem mass spectrometry

1. Durant, A.A.
2. Fente, C.A.
3. Franco, C.M.
4. Vázquez, B.I.
5. Mayo, S.
6. Cepeda, A.