1. Contrôle des pieux par la méthode des vibrations (Pile control by the vibration method);Briard;Ann Inst Tech Bâtim (Fr), 23rd year,1970
2. From theory to experience with the nondestructive vibration testing of piles;Davis;Proc Inst Civil Engrs, Part 2,1974
3. Economic pile testing;Davis;Ground Engng,1975
4. Contrôle non destructif des pieux en béton (Nondestructive control of concrete piles);Paquet;Ann Inst Tech Bâtim, (Fr), 29th year,1976
5. Integrity testing of concrete piles by shock method;Higgs;Concrete (UK),1979