1. Successful Conservation of a Threatened
Maculinea
Butterfly
2. Comparative Losses of British Butterflies, Birds, and Plants and the Global Extinction Crisis
3. Thomas J. A., et al.., in Studies in the Ecology and Conservation of Butterflies in Europe 2, , Settele J. , Kühn E. , Thomas J. A. , Eds. (Pensoft, Sofia, 2005), pp. 28–31.
4. European Commission Official Journal L 206 22/07/1992 7-50 (Council Directive 92/43/EEC; 1992; see http://ec.europa.eu/environment/nature/legislation/habitatsdirective/index_en.htm.
5. Settele J., Kühn E., Thomas J. A., Eds., Studies in the Ecology and Conservation of Butterflies in Europe 2 (Pensoft, Sofia, 2005).