9Burrough P A, Frank A U. Geographic Objects wilh Indeter- minate Boundaries[M]. London: Taylor& Francis, 1996.
10Huang C F, Shi Y. Towards Efficient Flizzy lnfilnnation Pro- cessing--Using the Principle of Infi-rmalion Diffusion [ M]- . Heidel-berg: PhysiC a-Verlag, 2002.
