Functional interaction between opioid and cannabinoid receptors in drug self-administration

1. Navarro, M.
2. Carrera, M.R.A.
3. Fratta, W.
4. Valverde, O.
5. Cossu, G.
6. Fattore, L.
7. Chowen, J.A.
8. Gómez, R.
9. Del Arco, I.
10. Villanúa, M.A.
11. Maldonado, R.
12. Koob, G.F.
13. Rodríguez De Fonseca, F.