Rumsey, F., Russell, S., Schaefer, H. & Rasbach, H. (2004). Distribution, Ecology and Cytology of Asplenium azoricum Lovis, Rasbach & Reichstein (Aspleniaceae, Pteridophyta) and Its Hybrids. American Fern Journal 94(3):113-125.
Rushton, S. P., Ormerod, S. J. & Kerby, G. (2004). New paradigms for modelling species distributions? Journal of Applied Ecology, 41: 193-200.
Russell, P., Jutzeler, D. & Volpe, G. (2004). The use of the pre-imaginal stages of the Macaronesian Hipparchia species in the clarification of the numbers and ranks of the taxa present in Madeira and the Azores archipelago (Lepidoptera: Nymphalidae, Satyrinae). Part 3: The populations of the western Azores islands of Flores and Corvo and general conclusions. Linneana Belgica Pars XIX(7):293-304.
Sánchez-Fernández, D., Lobo, J. M., Abellán, P., Ribera, I. & Millán, A. (2008). Bias in freshwater biodiversity sampling: the case of Iberian water beetles. Diversity and Distributions, 14: 754-762.
Söderström, L. Urmi, E. & Vána, J. (2002). Distribution of Hepaticae and Anthocerotae in Europe and Macaronesia. Lindbergia, 27: 3-47.
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