Fries B.E, Durance P.W, Nerenz D.R, Ashcraft M.L.  1993.  A comprehensive payment model for short- and long-stay psychiatric patients. Health Care Financing Review. 15(2):31-50.

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.