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4. Research & Development Division, Highways Department, HKSAR. Guidance Notes on Backcalculation of Layer Moduli and Estimation of Residual Life Using Falling Weight Deflectometer Test Data RD/GN/027A, Highways Department, Hong Kong Special Administrative Region Government, Hong Kong (2009)
5. Noureldin, S., Zhu, K., Harris, D., Li, S.: Non-Destructive Estimation of Pavement Thickness, Structural Number, and Subgrade Resilience Along INDOT Highways, Indiana Department of Transportation and the U.S. Department of Transportation Federal Highway Administration, United States (2005)