Reference

Beate Apfelbeck, Kim G. Mortega, Sarah Kiefer, Silke Kipper, Wolfgang Goymann (2013): Life-history and hormonal control of aggression in black redstarts: Blocking testosterone does not decrease territorial aggression, but changes the emphasis of vocal behaviours during simulated territorial intrusions – Frontiers in Zoology – 2013: 0001-8-0015.