@InProceedings{Förster and Roger Wattenhofer2016Lower,
	 author =	{Klaus-Tycho Förster and Roger Wattenhofer},
	 title =	{{Lower and Upper Competitive Bounds for Online Directed Graph Exploration}},
	 booktitle =	{{Theoretical Computer Science, Volume 655, Part A, pp. 15-29}},
	 month =	{},
	 year =		{2016}
}