1. Track modulus: its meaning and factors influencing it;Selig,1994
2. M/W costs: how they are affected by car weight and the track structure;Ahlf;Railway Track Struct,1975
3. Stiff track modulus considerations;Redden;Railway Track Struct,2002
4. Track modulus measurements at the Pueblo soft subgrade site;Read,1994
5. Using electrical properties to classify the strength properties of base course aggregates;Saarenketo,1995