Soares, M. D., R. Santos, N. L. Vijaykumar, and L. V. Dutra. “Analysis of User Behavior and Difficulty in Labeling Polygons of a Segmented Image in a Citizen Science Project”. INFOCOMP Journal of Computer Science, vol. 9, no. 4, Dec. 2010, pp. 34-42, https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/321.