1. Senecio alkaloids-the alkaloids of Senecio brasiliensis, fremonti and ambrosioides;Adams;J. Am. Chem. Soc.,1956
2. Flores silvestres de las Islas Canarias;Bramwell,2001
3. Metabolic defenses against plant allelochemicals;Brattsten,1992
4. Briggs, L.H., Cambie, R.C., C,Y, B.J., O'Donovan, G.M., Russell, R.H., Seelye, R.B., 1966. Collq. Int. N. R. S. (144), 147, C.A. 67, 54302, 1967.
5. The Pyrrolizidine Alkaloids;Bull,1968