AGUNWAMBA, J.; ADAGBA, T. A Comparative Analysis of the Rebound Hammer and Ultrasonic Pulse Velocity in Testing Concrete. Nigerian Journal of Technology, [S. l.], v. 31, n. 1, p. 31–39, 2012. DOI: 10.4314/njt.v31i1. Disponível em: https://www.ajol.info/index.php/njt/article/view/123556. Acesso em: 19 aug. 2026.