@article{NUMA_1989__56_2-3_133419,
     author = {R.E. Bank and B.D. Welfert and ...},
     title = {A {Class} of {Iterative} {Methods} for {Solving} {Saddle} {Point} {Problems.}},
     journal = {Numerische Mathematik},
     pages = {645--666},
     publisher = {mathdoc},
     volume = {56},
     number = {2-3},
     year = {1989},
     zbl = {0684.65031},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1989__56_2-3_133419/}
}