7Baladi G Y, Svasdisant T, Van T, et al. Cost--Effective Preventive Maintenanee Case Studies[G/CD]. Washington, DC: Transportation Research Board, 2002. CD-- ROM of the 81st Transportation Research Board Annual Meeting, 2002,.
8Hein D, Jean--Martin C. The Impact of Preventive Maintenance Programs on the Condition of Roadway Networks[C]//the 2004 Annual Conference of the Transportation Association of Canada. Quebec: Transportation Association of Canada, 2004.
9Labi S, Sinha K. The Effectiveness of Maintenance and Its Impact on Capital Expenditures[R]. Indianapolis: Indiana Department of Transportation, 2003.
10U. S Department of Transportation. FHWA--SA--99-- 015. Pavement Preservation: A Road Map for the Future. Kansas City: U. S Department of Transportation, 1998.
