Simultaneous Determination of Eight Coumarins in Angelica gigas and in Various Other Angelica Species by High Performance Liquid Chromatography and Comparative Micro-Morphology Study of Angelica Species - Avula, Bharathi; Joshi, Vaishali C; Reddy V L, Niranjan; Choi, Young-Whan; Khan, Ikhlas A (Planta Medica, 2007)