Heredia B. et al. 1996
Globally Threatened Birds in Europe : Action Plans
van Helsdingen P.J. et al. 1996
Background Information on Invertebrates of the Habitats
Directive and the Bern Convention
Strasbourg: Council of Europe, Nature and Environment, 79
ECCB 1995
Red Data Book of European Bryophytes
European Committee for Conservation of Bryophytes
Tucker G.M. et al. 1994
Birds in Europe : their Conservation Status
Cambridge: BirdLife International
Economic Commission For Europe 1991
European Red List of Globally Threatened Animals and
Plants
United Nations - ECE