Bouman HA, Ulloa O, Scanlan DJ, Zwirglmaier K, Li WK, Platt T, Stuart V, Barlow R, Leth O, Clementson L, Lutz V, Fukasawa M, Watanabe S, Sathyendranath S. Oceanographic basis of the global surface distribution of Prochlorococcus ecotypes. Science. 2006 May 12;312(5775):918–21. doi: 10.1126/science.1122692. PMID: 16690867.