4Gu W, X Wang, S E McGregor. Optimization of preventive health care i facility locations[J]. International Journal of Health Geographics, 2010, 9(1): 17-22,.
5Andrews G J, D R Phillips. Changing local geographies of pvate residential care for older people 1983-1999: lessons for social POlicy in England and Wales[J]. Social Science & Medicine, 2002, 55(2): 63-78.