@article{article4eb82d8e,
title   = {Conditioned antinociception and freezing using electrical stimulation of the dorsal periaqueductal gray or inferior colliculus as unconditioned stimulus are differentially regulated by 5-H'T IND.2A' receptors in rats},
author = {Castilho, V. M. and Brandão, Marcus Lira},
year = {2001},
doi = {10.1007/s002130100697},
journal   = {Psychopharmacology}
}