1. Payment restrictions for prescription drugs under Medicaid;Soumerai;The New England Journal of Medicine,1987
2. The effects of copayments and generic substitution on the use and costs of prescription drugs;Smith;Inquiry,1993
3. Effects of limiting Medicaid drug-reimbursement benefits on the use of psychotropic agents and acute mental health services by patients with schizophrenia;Soumerai;New England Journal of Medicine,1994
4. The impact of increasing patient prescription drug cost sharing on therapeutic classes of drugs received and on the health status of elderly HMO members;Johnson;Health Services Research,1997
5. Poirier S, LeLorier J, Pagé V, Lacour A. The effect of a $2 co-payment on prescription refill rates of Quebec elderly and its relationship to socio-sconomic status, Canadian Pharmaceutical Journal, December–January 1998;30–34.