References
- Adamus, P. R. & Clough, G. C., 1978: Evaluating species for protection in natural areas. — Biol. Conserv. 13: 165–178.
- Berntell, A., Wenblad, A., Henriksson, L., Nyman, H. & Oskarsson, H., 1983: Kriterier för värdering av sjöar från naturvårdssynpunkt. — Länsstyrelsen Älvsborgs län. Naturvårdsenheten 1983: 3, 47 pp. (in Swedish).
- Drury, W. H., 1974: Rare species. — Biol. Conserv. 6: 162–169.
- Maarel, E. VAN DER, 1978: Ecological principles for physical planning. In: The breakdown and restoration of ecosystems: 413–450 (eds. M. W. Holdgate & M. J. Woodman). Plenum Press, New York.
- Margules, C. & Usher, M. B., 1981: Criteria used in assessing wildlife conservation potential: a review. — Biol. Conserv. 21: 79–109.
- Nilsson, C., 1984: Criteria for the biological evaluation of the natural environment from a conservation viewpoint. — Statens Naturvårdsverk PM 1881 (in Swedish).
- Van Der Ploeg, S. W. F. & Vlijm, L., 1978: Ecological evaluation, nature conservation and land use planning with particular reference to methods used in the Netherlands. — Biol. Conserv. 14: 197–221.
- Ratcliffe, D. (ed.), 1977: A nature conservation review. The selection of biological sites of national importance to nature conservation in Britain. Vol. 1 & 2. — Cambridge Univ. Press, Cambridge, 401 + 320 pp.