1. Roos NP, Mustard CA: Variation in health and health care use by socioeconomic status in Winnipeg, Canada. Milbank Quarterly. 1997, 75: 89-111. 10.1111/1468-0009.00045.
2. Finkelstein MM: Do factors other than need determine utilization of physician services in Ontario?. CMAJ. 2001, 165: 565-570.
3. Heyden Van Der S, Demarest J, Tafforeau H, Van Oyen H: Socio-economic differences in the utilization of health services in Belgium. Health Policy. 2003, 65: 153-165. 10.1016/S0168-8510(02)00213-0.
4. Sutton M, Gravelle H, Morris S, Leyland A, Windmeijer F, Dibben C: Allocation of resources to English areas. 2002, Edinburgh: Department of Health,. Information and Service Division
5. Van Doorslaer E, Masseria C, OECD Health Equity Research Group Members: Income-Related Inequality in the Use of Medical Care in 21 OECD Countries. Health Working Paper No 14. 2004, Paris: OECD