B. Likar and F. Pernus, A hierarchical approach to elastic registration based on mutual information, Image and Vision Computing, vol.19, issue.1-2, pp.33-44, 2001.
DOI : 10.1016/S0262-8856(00)00053-6

Z. Lu and W. Chen, Fast and Robust 3-D Image Registration Algorithm Based on Principal Component Analysis, 2007 1st International Conference on Bioinformatics and Biomedical Engineering, pp.872-875, 2007.
DOI : 10.1109/ICBBE.2007.227

M. Bernier, R. Lepage, L. Lecomte, L. Tremblay, L. Dor-savard et al., Free-Form B-spline Deformation Model for Groupwise Registration, ISMRM, p.3255, 2011.