1. Untersuchungen uber fahrbahnuneben Heiten;Braun;Deut Kraft,1966
2. Some measurements and power spectra of runway roughness;Walls;NACA Technical Note 3305,1954
3. Runway roughness studies in the Aeronautical field;Houbolt;Journal of the Air Transport Division Proceedings, American Society of Civil Engineers,1961
4. An investigation into the statistical properties of the microprofile of the main types of motor road;Pevzner;Avtom Prom,1964
5. Investigations of the probability characteristics of the surfaces of distributed types of road;Parkhilovski;Avtom Prom,1968