1. Esveld C (1989) Modern railway track. MRT Productions, Duisburg
2. Ionescu D (2004) Evaluation of the engineering behaviour of railway ballast. PhD Dissertation, University of Wollongong, Australia
3. Lim WL (2004) Mechanics of railway ballast behaviour. PhD. Dissertation, University of Nottingham, UK
4. Selig ET, Waters JM (1994) Track geotechnology and substructure management. Thomas Telford, London
5. McMichael P, McNaughton A (2003) The stoneblower—delivering the promise. Development, testing and operation of a new track maintenance system. In: 82nd annual meeting. Transortation Research Board, Washington