@misc{indiciae36881ef87731,
  title = {Plankton secondary productivity and biomass: Their relation to lake trophic state},
  author = {G.L. Pederson and E.B. Welch and A.H. Litt},
  year = {1976},
  doi = {10.1007/bf00019816},
  url = {https://pubs.usgs.gov/publication/70001164},
  note = {Source identifier: 70001164}
}