1. Rilem tentative recommendations for in-situ concrete strength determination by non-destructive combined methods. Rilem 43 CND (2nd Draft), Athens, April 1981.
2. Johnson S. M.—Deterioration, maintenance and repair of concrete structures McGraw-Hill, 1965.
3. Akman M. S., Güner A.—The application of combined non-destructive testing with Schmidt rebound number and pulse velocity to concretes subjected to elevated temperatures. Meeting of Rilem 43 CND, Sinaia, 1980.
4. Akman M. S.—Relation between concrete compressive strength and combined non-destructive test results-computer programmes as a solution. Meeting of the Rilem Committee 43 CND, Stockholm, June 1979.
5. The Institution of structural Engineers-Fire resistance of concrete structures. Report of a Joint Committee, London. August 1975.