Sabu, T.K., Shiju, R.T., Vinod, K.V., Nithya, S. (2011): A comparison of the pitfall trap, Winkler extractor and Berlese funnel for sampling ground-dwelling arthropods in tropical montane cloud forests. Journal of Insect Science, 11: 28 available online: insectscience.org/11.28.
Sadaka, N., Ponge, J.F. (2003): Climatic effects on soil trophic networks and the resulting humus profiles in holm oak (Quercus rotundifolia) forests in the High Atlas of Morocco as revealed by correspondence analysis. Eur. J. Soil Biol., 54: 767-777.