Formation of Anthraquinones by the Tissue Culture of Cassia obtusifolia - Takahashi, Shuhichi; Kitanaka, Susumu; Takido, Michio; Ebizuka, Yutaka; Sankawa, Ushio; Hoson, Masayuki; Kobayashi, Miyoko; Shibata, Shoji (Planta Medica, 1978)