@InProceedings{Lenzen2010tight,
	author=	{Christoph Lenzen and Thomas Locher and Roger Wattenhofer},
	title=	{{Tight Bounds for Clock Synchronization}},
	booktitle=	{{Journal of the ACM, Volume 57, Number 2, New York, NY, USA}},
	month=	{January},
	year=	{2010},
}