Focused ultrasound solid-liquid extraction for the determination of organic biomarkers in beachrocks

1. Blanco-Zubiaguirre, L.
2. Arrieta, N.
3. Iturregui, A.
4. Martinez-Arkarazo, I.
5. Olivares, M.
6. Castro, K.
7. Olazabal, M.A.
8. Madariaga, J.M.