@article {799,
	title = {Estimation of Lung Motion Fields in 4D CT Data by Variational Non-Linear Intensity-Based Registration: A Comparison and Evaluation Study},
	journal = {Physics in Medicine and Biology},
	volume = {59},
	year = {2014},
	pages = {4247-4260},
	doi = {10.1088/0031-9155/59/15/4247},
	author = {Werner, René and Schmidt-Richberg, Alexander and Heinz Handels and Jan Ehrhardt}
}
