4Saaty T L. The analytic hierarchy process[ M ]. New York : McGraw- Hill, 1980.
5Saaty T L. A scaling method for priorities in hierarchical structures [ J]. Journal of Mathematical Psychology, 1977 ( 1 ) :234-281.
6Nico Goldseheider. Karst ground water vulnerability mapping : appli- cation of a new method in the Swabian Alb, Germany [ J ]. Hydroge- ology Journal,2005,13 (4) : 555- 564.
7Star J, Estes J. Geographic information systems:an introduction [ M ]. Englewood Cliffs, NJ : Prentice-Hal, 1990.
