Klaus Broelemann, Anjan Dutta, Xiaoyi Jiang and Josep Llados. 2014. Hierarchical Plausibility-Graphs for Symbol Spotting in Graphical Documents. _In_ Bart Lamiroy and Jean-Marc Ogier, _eds_. _Graphics Recognition. Current Trends and Challenges_. Springer Berlin Heidelberg, 25–37. (LNCS.)