1. Sexual Selection;Andersson,1994
2. Praat: Doing Phonetics by Computer. Version 4.3.01;Boersma,2005
3. The use of multiple cues in mate choice;Candolin;Biological Reviews,2003
4. Two-formant models, pitch and vowel perception;Carlson,1975
5. Female red deer prefer the roars of larger males;Charlton;Biology Letters,2007