Zeitschriftenartikel
Apfelbeck, B. A.; Goymann, W.: Ignoring the challenge? Male black redstarts (Phoenicurus ochruros) do not increase testosterone levels during territorial conflicts but they do so in response to gonadotropin-releasing hormone. Proceedings of the Royal Society B: Biological Sciences
278 (1722), S. 3233 - 3242 (2011)