1. Skill mix in the health care workforce: reviewing the evidence;Buchan;Bulletin of the World Health Organization,2002
2. Carr-Hill R.A. Currie E. Dixon P. 2003 Skill-Mix in Secondary Care: A Scoping Exercise
3. The country-level relationship between medical workforce and health outcomes in different income groups;Carr-Hill;Social Science and Medicine
4. What is a nurse;Currie;International Nursing Review,2013