1. [BfR] Bundesamt für Risikobewertung/Federal Institute of Risk Assessment, 2011. Chemical analysis and toxicity of pyrrolizidine alkaloids and assessment of the health risks posed by their occurrence in honey. BfR Opinion No. 038/2011. Berlin, Germany. http://www.bfr.bund.de/cm/349/chemical-analysis-and-toxicity-of-pyrrolizidine-alkaloids-and-assessment-of-the-health-risks-posed-by-their-occurence-in-honey.pdf. The full version of this BfR Opinion is available in German on 〈http://www.bfr.bund.de/cm/343/analytik-und-toxizitaet-von-pyrrolizidinalkaloiden.pdf〉. Accessed 06 March 2017.
2. Determination of pyrrolizidine alkaloids (PA) in honey by SPE-LC-MS/MS;[BfR] Bundesamt für Risikobewertung/Federal Institute of Risk Assessment;Method Protoc.,2013
3. EFSA panel on contaminants in the food chain (CONTAM); Scientific opinion on pyrrolizidine alkaloids in food and feed;[EFSA] European Food Safety Authority;EFSA J.,2011
4. Committee on Herbal Medicinal Products (HMPC) Public statement on contamination of herbal medicinal products/traditional herbal medicinal products with pyrrolizidine alkaloids;[EMA] European Medicines Agency;Transit. Recomm. risk Manag. Qual. Control,2016
5. Pyrrolizidine alkaloids Health and safety guide;[IPCS] International Programme on Chemical Safety,1989