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Morris J.N, Fries B.E, Mehr D.R, Hawes C., Phillips C., Mor V., Lipsitz L.A.  1994.  MDS Cognitive Performance Scale. Journal of Gerontology. 49(4):M174-82.

Hartmaier S.L, Sloane P.D, Guess H.A, Koch G.G.  1994.  The MDS Cognition Scale: a valid instrument for identifying and staging nursing home residents with dementia using the minimum data set.. Journal of the American Geriatrics Society. 42(11):1173-9.

Phillips C.D, Hawes C..  1992.  Nursing home case-mix classification and residents suffering from cognitive impairment: RUG-II and cognition in the Texas case-mix data base. Medical Care. 30(2):105-16.