@conference {ruhnke12icra,
	title = {Highly Accurate 3D Surface Models by Sparse Surface Adjustment},
	booktitle = {Proc.~of the IEEE Int.~Conf.~on Robotics and Automation (ICRA)},
	year = {2012},
	month = {May},
	address = {St. Paul, MN, USA},
	doi = {10.1109/ICRA.2012.6225077},
	author = {Ruhnke, M. and K{\"u}mmerle, R. and Grisetti, G. and Burgard, W.}
}
