@article {38127,
	title = {The abundance and composition of freshwater Picocyanobacteria in relation to light penetration},
	volume = {36},
	year = {1991},
	pages = {1457-1462},
	publisher = {Limnology and Oceanography},
	url = {http://www.jstor.org/stable/2837651?seq=3},
	author = {Pick, F. R.}
}
