@InProceedings{Lenzen2008What,
	 author =	{Christoph Lenzen and Yvonne Anne Pignolet and  Roger Wattenhofer},
	 title =	{{What can be approximated locally? Case Study: Dominating Sets in Planar Graphs}},
	 booktitle =	{{TIK Report, Number 331}},
	 month =	{June},
	 year =		{2008}
}