The production of surface-active materials (surfactants) by axenic cultures of five marine diatoms, a dinoflagellate, and a coccolithophorid (all grown in uniform culture conditions) was determined by measuring the volume and stability of the foam produced by shaking....
Wilson, W. B., and Albert Collier. 1972. "The production of surface-active material by marine phytoplankton cultures." Journal of Marine Research 30, (1). https://elischolar.library.yale.edu/journal_of_marine_research/1225