5Su M R, Yang Z F, Chen B. Set pair analysis for urban eco- system health assessment [ J ]. Communications in Nonlinear Science and Numerical Simulation, 2009, 14 ( 1 ) : 1773 - 1780.
6Wu F F, Wang X. Eutrophication evaluation based on set pair analysis of baiyangdian lake, North China [ J ]. Procedia Environmental Sciences ,2012,13 : 1030 - 1036.