@article{articlefbd184a3,
title   = {Effects of intraperitoneal administration of antagonists and development of morphine tolerance on the antinociception induced by stimulating the anterior pretectal nucleus of the rat},
author = {Ress, H and Prado, W A and Rawlings, S and Roberts, M H T},
year = {1987},
doi = {10.1111/j.1476-5381.1987.tb11380.x},
journal   = {British Journal of Pharmacology}
}