1. Bembridge JD, Kedwards TJ, Edwards PJ (1998) Variation in earthworm populations and methods for assessing responses to perturbations. In: Sheppard SC, Bembridge JD, Holmstrup M, Posthuma L (eds) Advances in earthworm ecotoxicology. SETAC Press, Pensacola, pp 341–352
2. Bouché M (1972) Lombriciens de France. Ecologie et Systematique. INRA Publ. 72–2. Institut National de Recherches Agriculturelles, Paris, p 671
3. EC (2001) Directive 2001/82/EC of the European Parliament and of the Council of 6 November 2001 on the Community code relating to veterinary medicinal products. Off J Eur Communities L311:1–66
4. EMEA (2008) Revised guideline on environmental impact assessment for veterinary medicinal products in support of the VICH guidelines GL6 and GL38. Committee for Medicinal Products for Veterinary Use (CVMP), European Medicines Agency, London. EMEA/CVMP/ERA/418282/2005-Rev.1
5. Floate KD, Wardhaugh KG, Boxall ABA, Sherratt TN (2005) Fecal residues of veterinary parasiticides: nontarget effects in the pasture environment. Annu Rev Entomol 50:153–179