@article{rybak_gahr_2004,  title={Modulation by steroid hormones of a ''sexy'' acoustic signal in an Oscine species, the Common Canary Serinus canaria},  volume={76},  ISSN={0001-3765},  url={https://doi.org/10.1590/S0001-37652004000200026},  DOI={10.1590/S0001-37652004000200026},  number={2},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={Rybak, Fanny and Gahr, Manfred},  year={2004},  month={Jun},  pages={365–367} }