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4. ASTM D 5298-94, 1995. Standard test method for measurement of soil potential (suction) using filter paper. 4.09, 154–159.
5. Barksdale, R.D., 1972. Laboratory evaluation of rutting in base course materials. In: Proceedings, 3rd international conference on structural design of asphalt pavement, London. Rotterdam: Balkema, 161–174.