@article{GDZPPN001185896,
title = {On a hierarchical basis multilevel method with nonconforming P1 elements.},
journal = {Numerische Mathematik},
volume = {63},
year = {1992},
pages = {189-212},
zbl = {0767.65078},
url = {http://dml.mathdoc.fr/item/GDZPPN001185896}
}
Oswald, P. On a hierarchical basis multilevel method with nonconforming P1 elements.. Numerische Mathematik, Tome 63 (1992) pp. 189-212. http://gdmltest.u-ga.fr/item/GDZPPN001185896/