Zinser, E. R., Coe, A., Johnson, Z. I., Martiny, A. C., Fuller, N. J., Scanlan, D. J., & Chisholm, S. W. (2006). Prochlorococcus Ecotype Abundances in the North Atlantic Ocean As Revealed by an Improved Quantitative PCR Method. Applied and Environmental Microbiology, 72(1), 723–732. https://doi.org/10.1128/aem.72.1.723-732.2006