Dobson, F. S., Nolan, P. M., Nicolaus, M., Bajzak, C., Coquel, A., & Jouventin, P. (2008). Comparison of color and body condition between early and late breeding King Penguins. Ethology, 114(9), 925-933. doi:10.1111/j.1439-0310.2008.01545.x.