Arno ScharlAlexander Hubmann-HaidvogelGerhard WohlgenanntAlbert WeichselbraunAstrid DickingerScalable annotation mechanisms for digital content aggregation and context-aware authoring.376-3802011IHC+CLIHChttp://dl.acm.org/citation.cfm?id=2254498conf/ihc/2011db/conf/ihc/ihc2011.html#ScharlHWWD11