The British Journal of Psychiatry, 101,281-301 Kay & Roth, 1992 This disorder is also distinguished from schizophrenia by a lower hereditary occurrence, less premorbid maladjustment, and a slower rate of progression.
The British Journal of Psychiatry, 101,281-301 Roth, M. & Kay, D. W. K. (1998). International Journal of Geriatric Psychiatry, 13,775-784 This disorder is also distinguished from schizophrenia by a lower hereditary occurrence, less premorbid maladjustment, and a slower rate of progression.