Am J Psychiatry. 1964 Aug;121:105-15. doi: 10.1176/ajp.121.2.105.
PMID:14194207
The differentiation of DSM-III-R psychotic depression in later life from nonpsychotic depression: comparisons of brain changes measured by multispectral analysis of magnetic resonance brain images, neuropsychological findings, and clinical features.
Simpson S, Baldwin RC, Jackson A, Burns A.
Biol Psychiatry. 1999 Jan 15;45(2):193-204. doi: 10.1016/s0006-3223(98)00006-7.
PMID:9951567
The pattern of depressive symptoms and factor analysis of the Cornell Scale among patients in Norwegian nursing homes.
Barca ML, Selbaek G, Laks J, Engedal K.
Int J Geriatr Psychiatry. 2008 Oct;23(10):1058-65. doi: 10.1002/gps.2033.