3Hannan, E. L. Linear programming with multiple fuzzy goals[J].Fuzzy sets and Sys. ,1981,6:235 ~ 248.
4Chang, N. B. ,and Wang S.F. ,A locational model for the site selection of SWM facilities with traffic congestion constraint[J].Civ. Ehgrg. Sys., 1994,11:287 ~ 306.
5G.A.Marques,J.A.S.Tenorio,Use of froth flotation to separate PVC/PET mixtures[ J]. WasteManagement, 2000, (20):265 ~269.
6Uta Krogmann, Effects of season and population density on source- separated waste composts [ J ]. Waste Management & Research, 1999, (17): 109 ~ 123.