@article{etna_vol39_pp437-463, author = {Dirk A. Lorenz and Peter Maass and Pham Q. Muoi}, title = {Gradient descent for Tikhonov functionals with sparsity constraints: Theory and numerical comparison of step size rules}, journal = {Electron. Trans. Numer. Anal.}, volume = {39}, year = {2012}, pages = {437--463}, }