Rock, paper, and scissors: Extrinsic vs. intrinsic similarity of non-rigid shapes
A.M. Bronstein, M.M. Bronstein, R. Kimmel, in:, 11th International Conference on Computer Vision, IEEE, 2007.

Symmetries of non-rigid shapes
D. Raviv, A.M. Bronstein, M.M. Bronstein, R. Kimmel, in:, 11th International Conference on Computer Vision, IEEE, 2007.