Ringl, Alexandra; Prinz, Sonja; Huefner, Antje; Kurzmann, Michael; Kopp, Brigitte (2007). "Chemosystematic Value of Flavonoids from Crataegus × macrocarpa (Rosaceae) with special Emphasis on (R)- and (S)-Eriodictyol-7-O-glucuronide and Luteolin-7-O-glucuronide". Chemistry & Biodiversity. 4 (2): 154–162. doi:10.1002/cbdv.200790020. ISSN1612-1872. PMID17311228.
Ringl, Alexandra; Prinz, Sonja; Huefner, Antje; Kurzmann, Michael; Kopp, Brigitte (2007). "Chemosystematic Value of Flavonoids from Crataegus × macrocarpa (Rosaceae) with special Emphasis on (R)- and (S)-Eriodictyol-7-O-glucuronide and Luteolin-7-O-glucuronide". Chemistry & Biodiversity. 4 (2): 154–162. doi:10.1002/cbdv.200790020. ISSN1612-1872. PMID17311228.
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Ringl, Alexandra; Prinz, Sonja; Huefner, Antje; Kurzmann, Michael; Kopp, Brigitte (2007). "Chemosystematic Value of Flavonoids from Crataegus × macrocarpa (Rosaceae) with special Emphasis on (R)- and (S)-Eriodictyol-7-O-glucuronide and Luteolin-7-O-glucuronide". Chemistry & Biodiversity. 4 (2): 154–162. doi:10.1002/cbdv.200790020. ISSN1612-1872. PMID17311228.