TY - JOUR TI - Effects of intraperitoneal administration of antagonists and development of morphine tolerance on the antinociception induced by stimulating the anterior pretectal nucleus of the rat PY - 1987 AU - Ress, H AU - Prado, W A AU - Rawlings, S AU - Roberts, M H T T2 - British Journal of Pharmacology DO - 10.1111/j.1476-5381.1987.tb11380.x UR - https://doi.org/10.1111/j.1476-5381.1987.tb11380.x VL - 92 SP - 769-79 ER -