Masello, J. F., Quillfeldt, P., Munimanda, G. K., Klauke, N., Segelbacher, G., Schaefer, H. M., et al. (2011). The High Andes, gene flow and a stable hybrid zone shape the genetic structure of a wide-ranging South American parrot. Frontiers in Zoology, 8: 16. doi:10.1186/1742-9994-8-16.