@techreport{tech201157,
  title = {Results of an observational study on sketching},
  author = {Cindy Grimm},
  number = {2011-57},
  institution = {Washington University in St. Louis},
  school = {Department of Computer Science and Engineering},
  note = {Presented as a poster at Sketch-based interfaces and modeling, 2011. Full images and videos here.},
  month = {June},
  year = {2011}
}