@inproceedings{CHI-2009-KarapanosZFM,
	author        = "Evangelos Karapanos and John Zimmerman and Jodi Forlizzi and Jean-Bernard Martens",
	booktitle     = "{Proceedings of the 27th ACM SIGCHI Conference on Human Factors in Computing Systems}",
	doi           = "10.1145/1518701.1518814",
	isbn          = "978-1-60558-246-7",
	pages         = "729--738",
	publisher     = "{ACM}",
	title         = "{User experience over time: an initial framework}",
	year          = 2009,
}