Beckers, Gabriel J. L. Abteilung Gahr, Seewiesen, Max Planck Institut für Ornithologie, Max Planck Society;
Ohms, V. R., Beckers, G. J. L., ten Cate, C., & Suthers, R. A. (2012). Vocal tract articulation revisited: The case of the monk parakeet. The Journal of Experimental Biology, 215(1), 85-92. doi:10.1242/jeb.064717.