Rogalla, S.; Nicolai, M.P.J.; Porchetta, S.; Glabeke, G.; Battistella, C.; D'Alba, L.; Gianneschi, N.C.; van Beeck, J.; Shawkey, M.D. (2021). The evolution of darker wings in seabirds in relation to temperature-dependent flight efficiency. J. R. Soc. Interface 18(180): 20210236. https://dx.doi.org/10.1098/rsif.2021.0236, meer
Kulp, F.B.; D'Alba, L.; Shawkey, M.D.; Clarke, J.A. (2018). Keratin nanofiber distribution and feather microstructure in penguins. The Auk 135(3): 777-787. https://dx.doi.org/10.1642/AUK-18-2.1, meer
