@article {189,
	title = {Modern approach to the classification system of Cyanophytes 4-Nostocales},
	journal = {Algological Studies/Archiv f{\"u}r Hydrobiologie, Supplement Volumes},
	year = {1989},
	pages = {247{\textendash}345},
	author = {Komarek, Jiri and Anagnostidis, Konstantinos}
}
