TY - JOUR AU - Assimopoulou, A N; Papageorgiou, V P TI - Radical scavenging activity of Alkanna tinctoria root extracts and their main constituents, hydroxynaphthoquinones JO - Phytother Res VL - 19 PY - 2005 DO - 10.1002/ptr.1645 SP - 141 EP - 147 ER -