Normal aging, Alzheimer's disease and senile dementia. Aspects on etiology, pathogenesis, diagnosis and treatment : proceedings of two symposia held at The Collegium Internationale Neuro-Psychopharmacologicum 14th Congress, June 22 and 23, 1984, Florence, Italy - Gottfries, Carl-Gerhard, 1928- (Editions de l'Université de Bruxelles, 1985)