1. Acute poisoning of cattle by common ragwort;Cockburn;Vet. Rec.,1955
2. Ragwort poisoning in cattle and cirrhosis of the liver in horses;Craig;Vet. Rec.,1930
3. Craig , A. M. Meyer , C. Koller , L. D. Schmitz , J. A. 1978 Serum enzyme tests for pyrrolizidine alkaloid toxicosis Am. Ass. Vet. Lab. Diagnost. 21st Ann. Proc. 161 178
4. The clinical aspects of ragwort poisoning in horses;Ford;Vet. Ann.,1973