Florian Steinke Matthias Hein Jan Peters Bernhard Schölkopf Manifold-valued Thin-Plate Splines with Applications in Computer Graphics. 437-448 2008 27 Comput. Graph. Forum 2 http://dx.doi.org/10.1111/j.1467-8659.2008.01141.x db/journals/cgf/cgf27.html#SteinkeHPS08