Thomas H. Crook

Global Deterioration Scale (GDS).

B. Reisberg, M. D. de Leon, S. Ferris, 1988, Psychopharmacology bulletin.

Equivalent spatial-rotation deficits in normal aging and Alzheimer's disease.

B. Reisberg, S. Ferris, R. Bartus, 1988, Journal of clinical and experimental neuropsychology.