T. Schüle, Schnörr, C., Weber, S., and Hornegger, J.,
“Discrete Tomography By Convex-Concave Regularization and D.C. Programming”,
Discr. Appl. Math., vol. 151, pp. 229-243, 2005.
M. Heiler and Schnörr, C.,
“Learning Sparse Image Codes by Convex Programming”, in
Proc. Tenth IEEE Int. Conf. Computer Vision (ICCV'05), Beijing, China, 2005, pp. 1667-1674.