1. De Wied, D., Bohus, B., van Ree, J. M. & Urban, I. J. Pharm. exp. Ther. 204, 570–580 (1978).
2. De Wied, D., Bohus, B., van Ree, J. M., Kovács, G. L. & Greven, H. M. Lancet i, 1046 (1978).
3. De Wied, D., Kovács, G. L., Bohus, B., van Ree, J. M. & Greven, H. M. Eur. J. Pharmac. 49, 427–436 (1978).
4. Van Ree, J. M., Bohus, B. & de Wied, D. in Endogenous and Exogenous Opiate Agonists and Antagonists (Way, E. L., ed.) (Pergamon, New York, in the press).
5. De Wied, D. in Characteristics and Function of Opioids (eds van Ree, J. M. & Terenius, L.) 113–122 (North-Holland, Amsterdam, 1978).