@article{GDZPPN001170783,
title = {The Finite Element Method with Lagrangian Multipliers.},
journal = {Numerische Mathematik},
volume = {19},
year = {1972},
pages = {179-192},
zbl = {0258.65108},
url = {http://dml.mathdoc.fr/item/GDZPPN001170783}
}
Babuska, Ivo. The Finite Element Method with Lagrangian Multipliers.. Numerische Mathematik, Tome 19 (1972) pp. 179-192. http://gdmltest.u-ga.fr/item/GDZPPN001170783/