Ezeagu, C. A., J. Udebunu, and S. M. Obiorah. “Destructive and Non-Destructive Assessment of Collapsed Structures in Onitsha, Anambra State, Nigeria”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 12, no. 1, May 2015, pp. 170-86, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/564.