1. Occurrence, fate and effects of pharmaceutical substances in the environment- A review
2. Veterinary antibiotics in the aquatic and terrestrial environment
3. Council Directive 93/39/EEC of 14 June 1993 amending Directives 65/65/EEC, 75/318/EEC and 75/319/EEC in respect of medicinal products, Off. J. L 214, 24/08/1993, 0022–0030 Luxembourg, 14 June 1993.
4. Note for Guidance: Environmental Risk Assessment of Veterinary Medical Products Other than GMO-containing and Immunological Products, European Union, EMEA/CVMP/055/96,1996
5. Council Directive 2001/82/EC on the Community code relating to veterinary medicinal products, Off. J. Eur. Commun. L 311/16 November 2001.