Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{NUMA_1979__33_132641, author = {J. Pitk\"aranta}, title = {Boundary {Subspaces} for the {Finite} {Element} {Method} {With} {Lagrange} {Multipliers.}}, journal = {Numerische Mathematik}, pages = {273--290}, publisher = {mathdoc}, volume = {33}, year = {1979}, zbl = {0422.65062}, url = {http://geodesic.mathdoc.fr/item/NUMA_1979__33_132641/} }
J. Pitkäranta. Boundary Subspaces for the Finite Element Method With Lagrange Multipliers.. Numerische Mathematik, Tome 33 (1979), pp. 273-290. http://geodesic.mathdoc.fr/item/NUMA_1979__33_132641/