참고문헌
- R. Mitchell, M.G. Baggott and J. Birks. 1987. Steel sleepers: An engineering approach to improved productivity, Conf. on Railway Eng., Perth, Australia.
- T. Koh and S. Hwang. 2015. Field evaluation and durability analysis of an eco-friendly pressurised concrete sleeper, J. Materials in Civil Eng., 27(7).
- DG environment news alert service. 2008. Treating old railway sleepers as hazardous waste, European Commission.
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