Modulation of male song by naloxone in the medial preoptic nucleus
Behavioral Neuroscience (2013) - Comment
pubmed: 23544595  doi: 10.1037/a0032329  issn: 1939-0084  issn: 0735-7044 

Cynthia A. Kelm-Nelson, Sharon A. Stevenson, Melissa A. Cordes, Lauren V. Riters