1. Bandyopadhyay, S. S. and Frantzen, J. A. (1983). “Investigation of moisture-induced variation in subgrade modulus by cross-correlation method.” Journal of Transportation Research Board, Vol. 945, pp. 10–15.
2. Cumberledge, G., Hoffman, G. L., Bhajandas, A. C., and Cominsky, R. J. (1974). “Moisture variation in highway subgrades and the associated change in surface deflections.” Journal of Transportation Research Board, Vol. 497, pp. 40–49.
3. FHWA (1994). LTPP seasonal monitoring program: Instrumentation, installation and data collection guide lines, Report No. FHWA–RD–94–110, U.S. Department of Transportation.
4. FHWA (1999). An input for moisture calculations—dielectric constant from apparent length, Report No. FHWA-RD-99-201, U.S. Department of Transportation.
5. FHWA (2000). Moisture content for unbound materials at seasonal monitoring program sites, Report No. FHWA-RD-00-077, U.S. Department of Transportation.