U. V. Elstrøm, B. A. Wysocka, L. P. Muren, and J. B. Petersen, “Daily kV cone-beam CT and deformable image registration as a method for studying dosimetric consequences of anatomic changes in adaptive IMRT of head and neck cancer”, AO, vol. 49, no. 7, pp. 1101–1108, Oct. 2010.