1. Andersson, P. and Nyberg, P.: 1984, Rep. Inst. Freshw. Res., Drottningholm 61, 34?47.
2. Bergheim, A. and Hesthagen, T.: 1990, J. Fish Biol. 36, 545?562.
3. Bohlin, T., Hamrin, S., Heggberget, T.G., Rasmussen, G. and Saltveit, S.J.: 1989, Hydrobiohgia 173, 9?43.
4. Elson, P.F.: 1957, Can. Fish. Cult. 21, 1?6.
5. Fjellheim, A. and Raddum, G.G.: 1995, ?Vikedalselva. Bunndyr?, in: ?Kalking i vann og vassdrag. Overv�king avst�rre prosjekter 1994?, DN-notat, Directorate for Nature Management, Trondheim, Norway, submitted. [In Norwegian].