@article{GDZPPN001175416,
title = {Boundary Subspaces for the Finite Element Method With Lagrange Multipliers.},
journal = {Numerische Mathematik},
volume = {33},
year = {1979},
pages = {273-290},
zbl = {0422.65062},
url = {http://dml.mathdoc.fr/item/GDZPPN001175416}
}
Pitkäranta, J. Boundary Subspaces for the Finite Element Method With Lagrange Multipliers.. Numerische Mathematik, Tome 33 (1979) pp. 273-290. http://gdmltest.u-ga.fr/item/GDZPPN001175416/