1. Abu-Abed, S., Dolle, P., Metzger, D., Beckett, B., Chambon, P., & Petkovich, M. (2000). The retinoic acid-metabolizing enzyme, CYP26A1, is essential for normal hindbrain patterning, vertebral identity, and development of posterior structures. Genes and Development, 15, 226–240.
2. Acosta Hospitaleche, C., Tambussi, C., Donato, M., & Cozzuol, M. (2007). A new Miocene penguin from Patagonia and its phylogenetic relationships. Acta Palaeontologica Polonica, 52(2), 299–314.
3. Alexander, T., Nolte, C., & Krumlauf, R. (2009). Hox Genes and segmentation of the hindbrain and axial skeleton. Annual Review of Cell and Developmental Biology, 25, 431–456.
4. Aubin, J., & Jeanotte, L. (2001). Implication des gènes Hox dans les processus d’organogenèse chez les mammifères. Medicine and Science, 17, 54–62.
5. Baumel, J. J., King, A. S., Breazile, J. E., Evans, H. E., & Vanden Berge, J. C. (1993). Handbook of avian anatomy: Nomina anatomica avium (2nd ed.). Cambridge, MA: Publications of the Nuttall Ornithological Club.