@article{Kondratyeva_2002
author = {N. V. Kondratyeva and O. A. Kislova},
title = {Variability of life cycles of Nostoc Vauch. (Cyanophyta) and problems of systematics},
journal = {International Journal on Algae},
issn = {1521-9429},
year = {2002},
volume = {4},
number = {2},
pages = {72--85}
}