References
- Frost, S., Huni, A. & Kershaw, W. E., 1971: Evaluation of a kicking technique for sampling stream bottom fauna. — Can. J. Zool. 49: 167–173.
- Henriksen, A., Skogheim, O. K. & Rosseland, B. O., 1984: Episodic changes in pH and aluminium-speciation kill fish in a Norwegian salmon river. — Vatten 40: 255–260.
- Henriksen, A., Snekvik, E. & Volden, R., 1981: Changes in pH in 38 Norwegian rivers during the period 1966 to 1979. — State Pollution Control Authority, National Program for Environmental Monitoring. Report 2/81, 69 pp. (in Norwegian).
- Jonsson, B., 1976: Comparison of scales and otolithes for age determination in brown trout, Salmo trutta L. — Norw. J. Zool. 24: 295–301.
- Leivestad, H., Hendrey, G., Munitz, I. P. & Snekvik, E., 1976: Effects of acid precipitation on freshwater organisms. — SNSF Research report FR 6/76, Oslo.
- Raddum, G. G. & Fjellheim, A., 1985: Monitoring of invertebrates. — In: State Pollution Control Authority National Program for Environmental Monitoring. Rep. 201/85, Oslo. 190 pp. (in Norwegian).
- Raddum, G. G. & Fjellheim, A., — 1986: Monitoring of acidification by use of stream invertebrates. — Workshop on Acidification of Rivers and Lakes, Grafenau, Fed. Rep. of Germany. 7 pp.
- Raddum, G. G. & Fjellheim, A., — 1987: Effects of pH and aluminium on mortality, drift and moulting of the mayfly Baetis rhodani. — Annls. Soc. r. ZooL Belg. Suppl. 117: 77–87.
- Seber, G. A. F. & Le Cren, E. D., 1967: Estimating population parameters from catches large relative to the population. — J. Anim. Ecol. 36: 631–643.
- SFT, 1981: State Pollution Control Authority National Program for Environmental Monitoring. — Report 26/81, Oslo. 143 pp. (in Norwegian).
- SFT, 1985: State Pollution Control Authority National Program for Environmental Monitoring. — Report 201/85, Oslo. 190 pp. (in Norwegian).
- SFT, — 1987: State Pollution Control Authority National Program for Environmental Monitoring. — Report 296/87, Oslo. 200 pp. (in Norwegian).
- Skogheim, O. K. & Sivertsen, A., 1981: Chemical monitoring of water quality 1980. — Directorate for Fish and Wildlife, Rep. 6 - 1981, 74 pp. (in Norwegian).
- Skulberg, O., 1977: Freshwater investigations of the watersheds Naustdalsvassdraget, Angedalsvassdraget and Gjengedalsvassdraget, Sogn og Fjordane, 1975–1976. — 0–48/74 NIVA, Oslo, 125 pp. (in Norwegian).
- Surber, E. W., 1937: Rainbow trout and bottom fauna production in one mile of stream. — Trans. Amer. Fish. Soc. 66: 193–202.