| ONLINE | Abundance, Habitat Distribution and Geographical Range of Passeriformes in Madrid (Spain). An Autoecological Approach to Bird Conservation. | (Autor: Luis M. Carrascal) |
| ONLINE | Arthropods in the Los Monegros Region of Aragón, Spain (in Spanish) | (Autor: Javier Blasco Zumeta). |
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Ten Years Inventorying the Iberian Fauna: Results and Perspectives. | (Autores: M.A. Ramos, J.M. Lobo, M. Esteban). 2001. Biodiversity and Conservation, 10: 19-28 |