@inproceedings{DocEng-2011-BeelL,
	author        = "Jöran Beel and Stefan Langer",
	booktitle     = "{Proceedings of the 11th Symposium on Document Engineering}",
	doi           = "10.1145/2034691.2034709",
	isbn          = "978-1-4503-0863-2",
	pages         = "81--84",
	publisher     = "{ACM}",
	title         = "{An exploratory analysis of mind maps}",
	year          = 2011,
}