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X. Pennec and N. Ayache, Uniform distribution, distance and expectation problems for geometric features processing, Journal of Mathematical Imaging and Vision, vol.9, issue.1, pp.49-67, 1998.
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X. Pennec, N. Ayache, and J. Thirion, Landmark-based registration using features identified through differential geometry, Handbook of Medical Imaging, chapter 31, pp.499-513, 2000.
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X. Pennec, C. R. Guttmann, and J. Thirion, Feature-based registration of medical images: Estimation and validation of the pose accuracy, Proc. of First Int. Conf. on Medical Image Computing and Computer-Assisted Intervention (MICCAI'98), volume 1496 of LNCS, pp.1107-1114, 1998.
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S. Granger, X. Pennec, and A. Roche, Rigid Point-Surface Registration Using an EM Variant of ICP for Computer Guided Oral Implantology, 4th Int. Conf. on Medical Image Computing and Computer-Assisted Intervention (MICCAI'01), pp.752-761, 2001.
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S. Granger and X. Pennec, Statistiques exactes et approchées sur les normales aléatoires, 2002.

P. T. Fletcher, S. Joshi, C. Lu, and S. Pizer, Gaussian Distributions on Lie Groups and Their Application to Statistical Shape Analysis, Poc of Information Processing in Medical Imaging (IPMI'2003), pp.450-462, 2003.
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P. T. Fletcher and S. C. Joshi, Principal Geodesic Analysis on Symmetric Spaces: Statistics of Diffusion Tensors, Proc. of CVAMIA and MMBIA Workshops, pp.87-98, 2004.
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X. Pennec, P. Fillard, and N. Ayache, A Riemannian Framework for Tensor Computing, International Journal of Computer Vision, vol.6, issue.2, 2005.
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P. Fillard, V. Arsigny, X. Pennec, P. Thompson, and N. Ayache, Extrapolation of Sparse Tensor Fields: Application to the Modeling of Brain Variability, Proc. of Information Processing in Medical Imaging 2005 (IPMI'05), pp.27-38, 2005.
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A. Roche, X. Pennec, G. Malandain, and N. Ayache, Rigid registration of 3-D ultrasound with MR images: a new approach combining intensity and gradient information, IEEE Transactions on Medical Imaging, vol.20, issue.10, pp.1038-1049, 2001.
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S. Nicolau, X. Pennec, L. Soler, and N. Ayache, Evaluation of a New 3D/2D Registration Criterion for Liver Radio-Frequencies Guided by Augmented Reality, International Symposium on Surgery Simulation and Soft Tissue Modeling (IS4TM'03), volume 2673 of Lecture Notes in Computer Science, pp.270-283
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