@article{ETNA_2012__39__a1,
     author = {Lorenz, Dirk A. and Maass, Peter and Muoi, Pham Q.},
     title = {Gradient descent for {Tikhonov} functionals with sparsity constraints: theory and numerical comparison of step size rules},
     journal = {Electronic transactions on numerical analysis},
     pages = {437--463},
     publisher = {mathdoc},
     volume = {39},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2012__39__a1/}
}