@article {SamAbsSriKla2012, author = {Samir, Chafik and Absil, P.-A. and Srivastava, Anuj and Klassen, Eric}, title = {A Gradient-Descent Method for Curve Fitting on {Riemannian} Manifolds}, journal = {Foundations of Computational Mathematics}, publisher = {Springer New York}, issn = {1615-3375}, pages = {49--73}, volume = {12}, issue = {1}, url = {http://dx.doi.org/10.1007/s10208-011-9091-7}, doi = {10.1007/s10208-011-9091-7}, year = {2012} }