Pyrrolizidine Alkaloids IPCS, ILO, WHO, UNEP ISBN 92411542802
This definitive work on Pyrrolizidine Alkaloids covers every aspect of the toxins in an extensive review of world wide studies. The report has been reproduced on the web for general use and can be accessed at http://www.inchem.org/documents/ehc/ehc/ehc080.htm
It is a substantial document of 347 pages. If your web download facilities are limited the file in .pdf format can be obtained from the Ragwort-UK library on CDRom