1. Culyer, A., Wagstaff, A.: Equity and equality in health and health care. J. Health Econ. 12(4), 431–457 (1993). doi: 10.1016/0167-6296(93)90004-X
2. Wagstaff, A., van Doorslaer, E.: Measuring and testing for inequity in the delivery of health care. J. Hum. Resour. 35(4), 716–733 (2000)
3. van Doorslaer, E., Koolman, X., Jones, A.: Explaining income-related inequalities in doctor utilisation in Europe. Health Econ. 13(7), 629–647 (2004). doi: 10.1002/hec.919
4. van Doorslaer, E., Koolman, X., Puffer, F.: Equity in the use of physician visits in OECD countries: has equal treatment for equal need been achieved? In: Measuring up: improving health system peformance in OECD countries. OECD, Paris (2002)
5. van Doorslaer, E., Masseria, C.: Income-related inequality in the use of medical care in 21 OECD countries. OECD Health Working Papers No. 14. OECD, Paris (2004)