@article{GDZPPN001181297,
title = {Mixed Finite Elements for Second Order Elliptic Problems in Three Variables.},
journal = {Numerische Mathematik},
volume = {55},
year = {1987},
pages = {237-250},
zbl = {0631.65107},
url = {http://dml.mathdoc.fr/item/GDZPPN001181297}
}
Brezzi, F.; Douglas, J., Jr.; Durán, R. Mixed Finite Elements for Second Order Elliptic Problems in Three Variables.. Numerische Mathematik, Tome 55 (1987) pp. 237-250. http://gdmltest.u-ga.fr/item/GDZPPN001181297/