5Burn, L.S., Tucker, S.N., Maheepala, S. & Mitchell,V. G. The Application of life cycle in urban water systems[A]. Proc. 4th Int. Conf. On Water Pipeline Systems, York,UK, 28 - 30 March 2001, ppl 1 - 24.
6National Research Council, Building research board, pay now or pay later[M]. Washington D.C.,1991.
7J. O. SOBANJO. Cost Estimating Under Uncertainty: Issues in Bridge Management[EB].TRB Transportation Research Circular.
8LIFE CYCLE COST ANALYSIS GUIDELINES[ EB ].Department of Natural Resources Energy Bureau Wallace State Office Building. 2002.
