TY  - RPRT
TI  - Plankton secondary productivity and biomass: Their relation to lake trophic state
AU  - G.L. Pederson
AU  - E.B. Welch
AU  - A.H. Litt
PY  - 1976
DO  - 10.1007/bf00019816
UR  - https://pubs.usgs.gov/publication/70001164
ID  - 70001164
ER  -