References
- Ahlgren, I. & Ahlgren, G., 1976: Vattenkemiska analysmetoder. — Institute of Limnology, Uppsala University, (in Swedish).
- Boström, B., 1981: Factors controlling the seasonal variations of nitrate in Lake Erken. — Int. Revue ges. Hydrobiol. 66: 821–836.
- Boström, B. & Pettersson, K., 1973: Fysikaliska och kemiska data från Erken sedan 1930-talet. — Scripta Limnologies Upsaliensia 344, 26 pp. (in Swedish).
- Healey, F. P. & Hendzel, L. L., 1980: Physiological indicators of nutrient deficiency in lake phytoplankton. — Can. J. Fish. Aquat. Sci. 41: 591–604.
- Hecky, R. E. & Kilham, P., 1988: Nutrient limitation of phytoplankton in freshwater and marine environments: A review of recent evidence on the effects of enrichment. — Limnol Oceanogr. 33: 796–822.
- Heyman, U., 1986: The response of photosynthetic parameters to environmental factors in Siggeforasjön, Sweden. — Arch. Hydrobiol. 106: 155–175.
- Istvánovics, V., Pierson, D. C., Pettersson, K. & Bell, R., in prep.: Phosphate uptake kinetics as an indicator of nutrient limitation in Lake Erken during the summer, manuscript, 18 pp.
- Lean, D. R. S. & Pick, F. R., 1981: Photosynthetic response of lake plankton to nutrient enrichment. A test for nutrient limitation. — Limnol. Oceanogr. 26: 1001–1019.
- Menzel, D. H. & Corwin, N., 1965: The measurement of total phosphorus in seawater based on the liberation of organically bound factors by per-sulfate oxidation. — Limnol Oceanogr. 10: 280–282.
- Pettersson, K., 1979: Enzymatic determination of orthophosphate in natural waters. — Int. Rev. ges. Hyrobiol. 64: 585–607.
- Pettersson, K. 1980: Alkaline phosphatase activity and algal surplus phosphorus as phosphorus-deficiency indicators in Lake Erken. — Arch. Hydrobiol. 89: 54–87.
- Pettersson, K. 1985 a: The Availability of Phosphorus and the Species Composition of the Spring Phytoplankton in Lake Erken. — Int. Rev. ges. Hydrobiol. 70: 527–546.
- Pettersson, K. 1985 b: Vattenöversikt Broströmmens vattensystem 1984. — Institute of Limnology, Uppsala University, LIU 1985 B: 8, 16 pp. (in Swedish).
- Strickland, J. D. H. & Parsons, T. R., 1972: A practical handbook of seawater analysis. — Bull. 167 Fisheries Res. Bd. Canada, Ottawa.
- Ulén, B., 1971: Elementarsammansättningen hos sötvattenplankton. — Scripta Limnologica Upsaliensia 270,12 pp. (in Swedish).
- Widell, A., 1970: Närsalterna i sjön Erken sommaren 1965. — Scripta Limnologica Upsaliensia 250, 24 pp. (in Swedish).