1. Track geotechnology and substructure management;Selig,1994
2. Ballast and subgrade response to train loads;Selig;Transp Res Rec,1978
3. Ballast research;Selig,1980
4. Comparison of robel supermat and plasser 07-16 track maintenance machines;Burks,1975
5. Damage caused to ballast by mechanical maintenance techniques;Wright,1983