@inproceedings{Zeidler-2013-EvaluationConstraintEditing,
	author = {Zeidler, Clemens and Lutteroth, Christof and Stuerzlinger, Wolfgang and Weber, Gerald},
	title = {Evaluating Direct Manipulation Operations for Constraint-Based Layout},
	booktitle = {Proceedings of the 14th IFIP TC 13 International Conference on Human-Computer Interaction (INTERACT)},
	publisher = {Springer},
	year = {2013},
	pages = {513--529}
}