Variation in pyrrolizidine alkaloid patterns of Senecio jacobaea Macel, Mirka ; Vrieling, Klaas ; Klinkhamer, Peter G. L. Abstract Publication: Phytochemistry Pub Date: April 2004 DOI: 10.1016/j.phytochem.2004.02.009 Bibcode: 2004PChem..65..865M