@inproceedings{2011-commentspace,
  title = {CommentSpace: Structured Support for Collaborative Visual Analysis},
  author = {Wesley Willett AND Jeffrey Heer AND Joseph Hellerstein AND Maneesh Agrawala},
  booktitle = {ACM Human Factors in Computing Systems (CHI)},
  year = {2011},
  url = {http://vis.stanford.edu/papers/commentspace}
}