1. Cairns T (1986) In: Waid JS (ed), PCBs and the environment, Vol. I. CRC Press, Inc., Boca Raton, Florida, USA, pp 1–45
2. Jensen S (1966) New Sci 32:612–618
3. Jensen A (1987) Sci Tot Environ 64:259–293
4. Hahne K, Heeschen A, Blüthgen A (1986) Milchwirtschaft 41:269–272
5. Keup A (1986) Diplomarbeit, FH Jülich