The value of REM sleep parameters in differentiating Alzheimer's disease from old-age depression and normal aging. - Dykierek,P.; Stadtmüller,G.; Schramm,P.; Bahro,M.; van Calker,D.; Braus,DF.; Steigleider,P.; Löw,H.; Hohagen,F.; Gattaz,WF.; Berger,M.; Riemann,D. (J Psychiatr Res, 1998)