References
- Hallegraeff, G. M., 1976: Pigment diversity in fresh-water phytoplankton. III. Summer phytoplankton of eight lakes with widely different trophic characteristics. — Hydrobiol. Bull. 10: 87–95.
- Lingeman, R., Flik, B. J. G. & Ringelberg, J., 1975: Stability of the oxygen stratification in a eutrophic lake. — Verh. Internat. Verein. Limnol. 19: 1193–1201.