@inproceedings{HCI-CCAD-1999-HassenzahlP,
	author        = "Marc Hassenzahl and Jochen Prümper",
	booktitle     = "{Proceedings of the Eighth International Conference on Human-Computer Interaction. Volume 2: Communication, Cooperation, and Application Design}",
	isbn          = "0-8058-3392-7",
	pages         = "107--111",
	publisher     = "{Lawrence Erlbaum}",
	title         = "{Designing usable keyword search systems}",
	year          = 1999,
}