* Center PH, Ernst E: Ginkgo biloba: a smart drug? A systemativ review of controlled trials of the cognitive effects of ginkgo biloba extracts in healthy people. Psychopharmacol Bull, 36, 108-123, 2002 | * Center PH, Ernst E: Ginkgo biloba: a smart drug? A systemativ review of controlled trials of the cognitive effects of ginkgo biloba extracts in healthy people. Psychopharmacol Bull, 36, 108-123, 2002 |