Chang, C., & Maciejewski, A. (). Fast eigenspace decomposition of correlated images. IEEE Trans. Image Processing, 9 (11), 1937–1949,.
Chang, C., Maciejewski, A., Roberts, R., & K. Srivastava, S. (). Saitwal “Quadtree-based eigendecomposition for pose detection in the presence of occlusion and background clutter. Pattern Analysis and Applications, 10 (1), 15–31,.