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, 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.

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.