Li, X., Matsumoto, K., Murakami, Y., Tezuka, Y., Wu, Y. and Kadota, S. (2005) Neuroprotective Effects of Polygonum Multiflorum on Nigrostriatal Dopaminergic Degeneration Induced by Paraquat and Maneb in Mice. Pharmacology Biochemistry and Behavior, 82, 345-352.