Carpenter G.I, Hirdes J.P, Ribbe M.W, Ikegami N., Challis D., Steel K., Bernabei R., Fries B..  1999.  Targeting and quality of nursing home care. A five-nation study. Aging-Clinical & Experimental Research. 11(2):83-9.

Fries B.E, Schneider D.P, Foley W.J, Gavazzi M., Burke R., Cornelius E..  1994.  Refining a case-mix measure for nursing homes: Resource Utilization Groups (RUG-III). Medical Care. 32(7):668-85.

Fries B.E, Mehr D.R, Schneider D., Foley W.J, Burke R..  1993.  Mental dysfunction and resource use in nursing homes. Medical Care. 31(10):898-920.

Feng Z., Grabowski D.C, Intrator O., Zinn J., Mor V..  2008.  Medicaid payment rates, case-mix reimbursement, and nursing home staffing--1996-2004. Medical Care. 46(1):33-40.

Mehr D.R, Fries B.E.  1995.  Resource use on Alzheimer's special care units.. Gerontologist. 35(2):179-84.

Phillips C.D, Hawes C., Lieberman T., Koren M.J.  2007.  Where should Momma go? Current nursing home performance measurement strategies and a less ambitious approach BMC Health Services Research. 7:93.

Kash B.A, Hawes C., Phillips C.D.  2007.  Comparing staffing levels in the Online Survey Certification and Reporting (OSCAR) system with the Medicaid Cost Report data: are differences systematic? Gerontologist. 47(4):480-9.