John Kasckow, Thomas Patterson, Ian Fellows, Shahrokh Golshan, Ellen Solorzano, Somaia Mohamed, Sidney Zisook,
Functioning in Middle Aged and Older Patients With Schizophrenia and Depressive Symptoms: Relationship to Psychopathology The American Journal of Geriatric Psychiatry. ,vol. 16, pp. 660- 663 ,(2008) ,
10.1097/JGP.0B013E31816FF746