@article{700329,
     title = {A stable and optimal complexity solution method for mixed finite element discretizations},
     booktitle = {Proceedings of Equadiff 10},
     series = {GDML\_Books},
     publisher = {Masaryk University},
     address = {Brno},
     year = {2002},
     pages = {27-35},
     mrnumber = {MR1981521},
     zbl = {1074.65527},
     url = {http://dml.mathdoc.fr/item/700329}
}

Brandts, Jan; Stevenson, Rob. A stable and optimal complexity solution method for mixed finite element discretizations, dans Proceedings of Equadiff 10, GDML_Books,  (2002), pp. 27-35. http://gdmltest.u-ga.fr/item/700329/