1. Barksdale, R. D., Laboratory evaluation of rutting in base course materials. In Proceedings of the Third International Conference on Structural Design of Asphalt Pavements, London, 1972, pp. 161–174
2. Lentz, R. W., Permanent deformation of cohesionless subgrade material under cyclic loading. Ph.D. Thesis, Dept. of Civil Eng., Michigan State Univ., East Lansing, 1979
3. Lentz, R. W. and Baladi, G. Y., Constitutive equation for permanent strain of sand subjected to cyclic loading. Transportation Research Record, 1981, 810, 50–54
4. Morgan, J. R., Laboratory tests on fine crushed rock. In Proceedings of the 6th Australian Road Research Board Conference, vol. 6, Part 5, 1972, pp. 179–194
5. Gerrard, C. M., Morgan, J. R. and Richards, B. G., An approach to the design of flexible pavements for Australian conditions. Australian Road Research Report, 1975, 5(8)