1. EN 196-3:2005, Methods of testing cement — Part 3: Determination of setting times and soundness, April 2005.
2. ASTM C 403-88, Standard test method for Time of Setting of Concrete Mixtures by Penetration Resistance, American society for testing and materials, 1988.
3. Hydration of cementitious materials by pulse echo USWR — method, apparatus and application examples;Valič;Cement and Concrete Research,2000
4. Continuous monitoring of setting and hardening of mortar and concrete;Reinhardt;Construction and building materials,2004
5. New developments in quality control of concrete using ultrasound, non-destructive testing in civil engineering;Grosse,2003