1. J.F.M. Nouws, J. Laurensen, Vet. Q. 12 (January) (1990).
2. Council Regulation (EEC) No. 2377/90, Off. J. Eur. Commun. L 224/1 (1990).
3. J.E.M. Van Koten-Vermeulen, M.F.A. Woulters, F.X.R. Van Leeuwen, WHO Food Additives Series, World Health Organization, Geneva, 1993.
4. Establishment of maximum residue levels of veterinary medical products in foodstuffs of animal origin, Council Regulation No. 2377/90 of EEC.
5. Improvement of chemical analysis of antibiotics