8[12]Radke J,Mu L.Spatial decomposition,modeling and mapping service regions to predict access to social programs[J].Geographic Information Sciences,2000,(6):105-112.
9[13]Weibull J W.An axiomatic approach to the measurement of accessibility[J].Regional Science and Urban Economics.1976,(6):357 -379.
10[14]Joseph A E,Bantock P R.Measuring potential physical accessibility to general practitioners in rural areas:a method and case study[J].Social Science and Medicine,1982,(16):85 -90.