1. The influence of vocal behavior on the performer's testicular activity in Budgerigars (Melopsittacus undulatus);Brockway;Wilson Bull.,1967
2. The timing of reproduction in the arid regions of Australia;Farner;Anat. Rec.,1960
3. Evolutionary aspects of Estrildid song;Hall;Symp. Zool. Soc. Lond.,1962