1. Ubel P, Goold S. ‘Rationing’ health care. Not all definitions are created equal. Arch Intern Med. 1998;158:209–14.
2. Beauchamp T, Childress J. Principles of Biomedical Ethics, Sixth Edition. Oxford, New York: Oxford University Press; 2008.
3. World Health Organization. World Health Report 2000. Health systems: improving performance. Geneva: WHO; 2004.
4. Duran A, Kutzin J, Martin-Moreno J, Travis P. Understanding health systems: scope, functions and objectives. In: Figueras J, McKee M, editors. Health Systems, Health, Wealth and Societal Well-being Assessing the Case for Investing in Health Systems. Maidenhead: Open University Press; 2012. p. 19–36.
5. Rechel B, Thomson S, van Ginneken E. Health systems in transition: template for authors. Copenhagen: World Health Organization, on behalf of the European Observatory on Health Systems and Policies; 2010.