@article{NUMA_1992__62_1_133657,
     author = {Sze-Ping Wong},
     title = {Preconditioning conforming finite element methods for treating {Dirichlet} boundary conditions. {I.}},
     journal = {Numerische Mathematik},
     pages = {391--412},
     publisher = {mathdoc},
     volume = {62},
     number = {1},
     year = {1992},
     zbl = {0761.65085},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1992__62_1_133657/}
}