1. 6) Raven, P.J., Holmes, N.T.H., Dawson, F.H., Fox, P., Everard, M., Fozzard, I.R., Rouen, K.J., 1997. River Habitat Quality: the physical character of rivers and streams in the UK and the Isle of Man. Environmental Agency, Bristol, USA.
2. 9) Lotka, A.J., 1922. Contributuion to the energetics of evolution. Proceedings National Academy of Science 8, 147-151.
3. 11) Odum, H.T., 1983. Systems Ecology, John Wiley and Sons, New York, USA.
4. 12) Jørgensen, S.E., 1992. Integration of ecosystem theories: A pattern. Kluwer Academic Publishers, Dordrecht, Netherlands.
5. 13) Jørgensen, S.E., 1992. Exergy and ecology. Ecological Modelling 63, 185-214.