Scherzer O. Variational Methods in Imaging / by Otmar Scherzer, Markus Grasmair, Harald Grossauer, Markus Haltmeier, Frank Lenzen ; edited by S.S. Antman, J.E. Marsden, L. Sirovich. // Springer eBooks. URL: http://dx.doi.org/10.1007/978-0-387-69277-7