A species-selective allelopathic substance from germinating sunflower (Helianthus annuus L.) seeds - Ohno, S; Tomita-Yokotani, K; Kosemura, S; Node, M; Suzuki, T; Amano, M; Yasui, K; Goto, T; Yamamura, S; Hasegawa, K (Phytochemistry, 2001)