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- Mang Tia and Byron E. Ruth (December 11, 1985). "Basic Rheology and Rheological Concepts Established by H. E. Schweyer". Asphalt Rheology: Relationship to Mixture: a Symposium Sponsored by ASTM Committee D-4 on Road and Paving Materials, Issue 941. Nashville, TN: ASTM International, 1987. pp. 118–145. Retrieved June 12, 2012.