@article{articlefddc0002,
title   = {Serotonin '5-HT IND 2'and '5-HT IND 1A' receptors in the periaqueductal gray matter differentially modulate tonic immobility in guinea pig},
author = {Monassi, Cláudia and Menescal-de-Oliveira, Leda},
year = {2004},
journal   = {Brain Research}
}