@article{etna_vol41_pp42-61, author = {Alexis Aposporidis and Panayot S. Vassilevski and Alessandro Veneziani}, title = {Multigrid preconditioning of the non-regularized augmented Bingham fluid problem}, journal = {Electron. Trans. Numer. Anal.}, volume = {41}, year = {2014}, pages = {42--61}, }