@article{article8edb6c1e,
title   = {Endogenous opiate analgesia induced by tonic immobility in guinea pigs},
author = {Leite-Panissi, C. R. A. and Rodrigues, C. L. and Brentegani, Mariulza Rocha and Menescal-de-Oliveira, Leda},
year = {2001},
doi = {10.1590/s0100-879x2001000200013},
journal   = {Brazilian Journal of Medical and Biological Research}
}