참고문헌

1. R. Mitchell, M.G. Baggott and J. Birks. 1987. Steel sleepers: An engineering approach to improved productivity, Conf. on Railway Eng., Perth, Australia.
2. 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).
3. DG environment news alert service. 2008. Treating old railway sleepers as hazardous waste, European Commission.
4. G. Graebe, J. Woidasky and F. Jv. 2010. Railway Sleepers from Mixed Plastic Waste, Rail Waste Project Status Information, Fraunhofer ICT.