Ultrasonic-assisted derivatization of estrogenic compounds in a cup horn booster and determination by GC-MS

1. Vallejo, A.
2. Usobiaga, A.
3. Martinez-Arkarazo, I.
4. Prieto, A.
5. Etxebarria, N.
6. Zuloaga, O.
7. Fernández, L.A.