@article{NUMA_1972__20_132183,
     author = {Ivo Babuska},
     title = {The {Finite} {Element} {Method} with {Lagrangian} {Multipliers.}},
     journal = {Numerische Mathematik},
     pages = {179--192},
     publisher = {mathdoc},
     volume = {20},
     year = {1972},
     zbl = {0258.65108},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1972__20_132183/}
}