@misc{indiciaea5037e897e37,
  title = {The influence of nitrogen on heterocyst production in blue-green algae},
  author = {Roann E. Ogawa and John F. Carr},
  year = {2003},
  doi = {10.4319/lo.1969.14.3.0342},
  url = {https://pubs.usgs.gov/publication/70006560},
  note = {Source identifier: 70006560}
}