Olsson, Marie E.; Gustavsson, Karl-Erik; Vågen, Ingunn M. (2010). "Quercetin and Isorhamnetin in Sweet and Red Cultivars of Onion (Allium cepaL.) at Harvest, after Field Curing, Heat Treatment, and Storage". Journal of Agricultural and Food Chemistry. 58 (4): 2323–30. doi:10.1021/jf9027014. PMID20099844.
Olsson, Marie E.; Gustavsson, Karl-Erik; Vågen, Ingunn M. (2010). "Quercetin and Isorhamnetin in Sweet and Red Cultivars of Onion (Allium cepaL.) at Harvest, after Field Curing, Heat Treatment, and Storage". Journal of Agricultural and Food Chemistry. 58 (4): 2323–30. doi:10.1021/jf9027014. PMID20099844.