1. Ahlemeyer B, Krieglstein J. Neuroprotective effects of Ginkgo biloba extract. Cell Mol Life Sci. 2003:60(9): 1779-92.
2. Akhondzadeh S, Noroozian M, Mohammadi M, Ohadinia S, Jamshidi AH, Khani M. Melissa officinalis extract in the treatment of patients with mild to moderate Alzheimer's disease: a double blind, randomised, placebo controlled trial. J Neurol Neurosurg Psychiatry. 2003;74(7):863-6.
3. Kumar V, Singh PN, Muruganandam AV, Bhattacharya SK. Effect of Indian Hypericum perforatum Linn on animal models of cognitive dysfunction. Ethnopharmacol. 2000;72(1-2):119-28.
4. Kumar V, Khanna VK, Seth PK, Singh PN, Bhattacharya SK. Brain neurotransmitter receptor binding and nootropic studies on Indian Hypericum perforatum Linn. Phytother Res. 2002;16(3):210-6.
5. Perry EK, Pickering AT, Wang WW, Houghton PJ, Perry NS. Medicinal plants and Alzheimer's disease: from ethnobotany to phytotherapy. J Pharm Pharmacol. 1999;51(5):527-34.
6. Perry NS, Court G, Bidet N, Court J, Perry E. European herbs with cholinergic activities: potential in dementia therapy. IntJ Geriatric Psychiatry 1996;! 1:1063-1069.
7. Van Kampen J, Robertson H, Hagg T, Drobitch R. Neuroprotective actions of the ginseng extract Gl 15 in two rodent models of Parkinson's disease. Exp Neurol. 2003;184(l):521-9.