Smith (1981). "Plant sources of hepatotoxic pyrrolizidine alkaloids". J. Nat. Prod. 44 (2): 129-15. doi:10.1021/np50014a001. PMID7017073.
Edgar (2002). "Honey from Plants Containing Pyrrolizidine Alkaloids: A Potential Threat to Health". J. Agric. Food Chem. 50 (10): 2719-2730. doi:10.1021/jf0114482. PMID11982390.
Kempf (Jan 2010). "Pyrrolizidine alkaloids (PAs) in honey and pollen-legal regulation of PA levels in food and animal feed required". Mol Nutr Food Res. 54 (1): 158-68. doi:10.1002/mnfr.200900529. PMID20013889.
Schoental (Nisan 1959). "Liver lesions in young rats suckled by mothers treated with the pyrrolizidine (Senecio) alkaloids, lasiocarpine and retrorsine". The Journal of Pathology and Bacteriology. 77 (2): 485-495. doi:10.1002/path.1700770220. PMID13642195.
Broch-Due, Å. I.; Aasen, A. J. (1980). "Alkaloids of Anchusa officinalis L. Identification of the Pyrrolizidine Alkaloid Lycopsamine". Acta Chem. Scand. B34: 75-77. doi:10.3891/acta.chem.scand.34b-0075.
Smith (1981). "Plant sources of hepatotoxic pyrrolizidine alkaloids". J. Nat. Prod. 44 (2): 129-15. doi:10.1021/np50014a001. PMID7017073.
Edgar (2002). "Honey from Plants Containing Pyrrolizidine Alkaloids: A Potential Threat to Health". J. Agric. Food Chem. 50 (10): 2719-2730. doi:10.1021/jf0114482. PMID11982390.
Kempf (Jan 2010). "Pyrrolizidine alkaloids (PAs) in honey and pollen-legal regulation of PA levels in food and animal feed required". Mol Nutr Food Res. 54 (1): 158-68. doi:10.1002/mnfr.200900529. PMID20013889.
Schoental (Nisan 1959). "Liver lesions in young rats suckled by mothers treated with the pyrrolizidine (Senecio) alkaloids, lasiocarpine and retrorsine". The Journal of Pathology and Bacteriology. 77 (2): 485-495. doi:10.1002/path.1700770220. PMID13642195.