1. Arbeitsgemeinschaft Boden, 1996. Bodenkundliche Kartieranleitung. Hannover.
2. Formalin-expulsion of earthworms (Lumbricidae) from Irish peat soils;Baker;Soil Biol. Biochem.,1985
3. Manipulation of earthworm populations in field experiments in agroecosystems;Blair;Acta Zool. Fenn.,1995
4. Comparaison critique de méthodes d’evaluation des populations de Lombricidés;Bouché;Pedobiologia,1969
5. Augers may bias field samples of soil mesofauna;Bruckner;Pedobiologia,1998