P. W. Johnson & J. M. Sieburth (1979). "Chroococcoid cyanobacteria in the sea: a ubiquitous and diverse phototrophic biomass". Limnology and Oceanography24 (5): 928–935. doi:10.4319/lo.1979.24.5.0928.
W. W. C. Gieskes & G. W. Kraay (1983). "Unknown chlorophyll a derivatives in the North Sea and the tropical Atlantic Ocean revealed by HPLC analysis". Limnology and Oceanography28 (4): 757–766. doi:10.4319/lo.1983.28.4.0757.
S. W. Chisholm, R. J. Olson, E. R. Zettler, J. Waterbury, R. Goericke & N. Welschmeyer (1988). "A novel free-living prochlorophyte occurs at high cell concentrations in the oceanic euphotic zone". Nature334 (6180): 340–343. doi:10.1038/334340a0.