1. W. N. CAREY, P. E. IRICK, 1960, Highway Research Bulletin, The road serviceability–performance concept
2. Modern Pavement Management;HASS,1994
3. The WASHO Road Test 1955 Part 2: test data analysis and findings, Special Report No., 22, Highway Research Board
4. The AASHO Road Test 1962 Report 5—pavement research, Special Report No., 61-E, Highway Research Board
5. Calibration of response-type road roughness measuring systems;GILLESPIE;Transportation Research Board, National Research Council, Washington, DC,1980