@inproceedings{CHI-2009-AkersSJW,
	author        = "David Akers and Matthew Simpson and Robin Jeffries and Terry Winograd",
	booktitle     = "{Proceedings of the 27th ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/1518701.1518804",
	isbn          = "978-1-60558-246-7",
	pages         = "659--668",
	publisher     = "{ACM}",
	title         = "{Undo and erase events as indicators of usability problems}",
	year          = 2009,
}