6Norton E. Long term care, in A. Cuyler & J. Newhouse (Eds.) : Handbook of Health Economics [C]. 2000, Volume 1 b, chapter 17.
7Orsini C. Changing the way the elderly live : evidence from the home health care market in the United States [J]. Journal of Public Economics,2010,94 (1-2) : 142-152.