TY  - RPRT
TI  - The influence of nitrogen on heterocyst production in blue-green algae
AU  - Roann E. Ogawa
AU  - John F. Carr
PY  - 2003
DO  - 10.4319/lo.1969.14.3.0342
UR  - https://pubs.usgs.gov/publication/70006560
ID  - 70006560
ER  -