Russo A, Monaco S, Romeo R, Pellitteri R, Stanzani S. Serotonergic collateralized projections from Barrington's nucleus to the medial preoptic area and lumbo-sacral spinal cord. Brain Res. 2004 Sep 03;1019(1-2):64–7. doi: 10.1016/j.brainres.2004.03.080. PMID: 15306239.