Flavonoids and Coumarins from Leaves of Phellodendron chinense - Kuo, Ping-Chung; Hsu, Meei-Yu; Damu, Amooru G; Su, Chung-Ren; Li, Chia-Ying; Sun, Han-Dong; Wu, Tian-Shung (Planta Medica, 2004)