Maier-Hein L, Mersmann S, Kondermann D, Stock C, Kenngott HG, Sanchez A, Wagner M, Preukschas A, Wekerle AL, Helfert S, Bodenstedt S. Crowdsourcing for reference correspondence generation in endoscopic images. In MICCAI (2) 2014 Sep 14 (pp. 349-356).