1. Berrios GE: The insanities of the third age: a conceptual history of paraphrenia. J Nutr Health Aging 2003, 7:394–399.
2. Kahlbaum K: Die Gruppirung der psychischen Krankheiten [in German]. Danzig, Germany: Kafemann; 1863.
3. Berrios GE: Presbyophrenia: the rise and fall of a concept. Psychol Med 1986, 16:267–275.
4. Kraepelin E: Dementia Praecox and Paraphrenia. Translated by Barclay RM. Edinburgh, Scotland: Livingstone; 1919.
5. Bianchi L: A Textbook of Psychiatry. London: Bailliere; 1906.