@inproceedings{nestler2008sudoku,
	Author = { Nestler, S. and Echtler, F. and Dollinger, A. and Klinker, G.},
	Title = {Collaborative problem solving on mobile hand-held devices and stationary multi-touch interfaces},
	Year = {2008},
	Month = {May},
	Booktitle = {PPD'08. Workshop on designing multi-touch interaction techniques for coupled public and private displays},
}