Catalan, F.C. and Almoro, P.F. 2007. Application of digital shearography in the analyses of surface deformation and photoelastic strain. Proceedings of the Samahang Pisika ng Pilipinas, 25(1), SPP-2007-PB-22. URL: https://proceedings.spp-online.org/article/view/SPP-2007-PB-22.