Proof of Efficacy of the Ginkgo biloba Special Extract EGb 761® in Outpatients Suffering from Mild to Moderate Primary Degenerative Dementia of the Alzheimer Type or Multi-Infarct Dementia - Kanowski,S.; Herrmann,W.M.; Stephan,K.; Wierich,W.; Hörr,R. (Pharmacopsychiatry, 1996)