Langmore S.E, Skarupski K.A, Park P.S, Fries B.E.  2002.  Predictors of aspiration pneumonia in nursing home residents. Dysphagia. 17(4):298-307.

Fries B.E, Morris J.N, Skarupski K.A, Blaum C.S, Galecki A., Bookstein F., Ribbe M..  2000.  Accelerated dysfunction among the very oldest-old in nursing homes. Journals of Gerontology Series A-Biological Sciences & Medical Sciences. 55(6):M336-41.