3Henry M Levin,Patrick J.McEwan.Cost-Effectiveness AnalysisMethods and Applications[]..2001
4Julio C Tresierra.Equitable Payments for Watershed Services:A Guide to Developing an Innovative Finance Mechanism[].Yannis KarmokoliasCost Benefit Analysis of Private Sector Environ mental Investments:A Case Study of the Kunda Cement Factory.1996