References
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- Montgomery, H. A. C., Thom, N. S. & Cockburn, A., 1964: Determination of dissolved oxygen by the Winkler method and the solubility of oxygen in pure water and sea water. — J. Appl. Chem. 14: 280–296.
- Ns4766, 1983: Determination of Chlorophyll a, Spectrophotometry Determination in Acetone Extract. — NSF: 8 pp. (In Norwegian).
- Wetzel, R. G., 1975: Limnology. — W.B. Saunders Company, Philadelphia, 743 pp.
- White, R. E., 1987: Introduction to the Principles and Practice of Soil Science. — Blackwell Scientific Publications, Oxford, 244 pp.