1. Alvarez-Cobelas, M., B. A. Jacobsen, 1992. Hypertrophie plankton: an overview. Freshwater Forum 2: 184–192.
2. Bailey-Watts, A. E., A. Kirika, L. May, D. H. Jones, 1990. Changes im phytoplankton over various time-scales in a shallow, eutrophic loch: the Loch Leven experience with special reference to the influence of flushing rate. Freshwat. Biol. 23: 85–112.
3. Bales, M., B. Moss, G. Phillips, K. Irvine, J. Stansfield, 1993. The changing ecosystem of a shallow, brackish lake, Hickling Broad, Norfolk, U.K. II. Long-term trends in water chemistry and ecology and their implications for restoration of the lake. Freshwat. Biol. 29: 141–165.
4. Björk, S., 1994. Overview. In M. Eiseltovd (ed.), Restoration of Lake Ecosystems. A holistic approach. IWRB Publ. 32: 1–5.
5. Carlson, R. E., 1977. A trophic state index for lakes. Limnol. Oceanogr. 22: 840–845.