@article{GDZPPN001176498,
title = {On Mixed Finite Element Methods for First Order Elliptic Systems.},
journal = {Numerische Mathematik},
volume = {37},
year = {1981},
pages = {29-48},
zbl = {0459.65072},
url = {http://dml.mathdoc.fr/item/GDZPPN001176498}
}
Nicolaides, R.A.; Fix, G.J.; Gunzburger, M.D. On Mixed Finite Element Methods for First Order Elliptic Systems.. Numerische Mathematik, Tome 37 (1981) pp. 29-48. http://gdmltest.u-ga.fr/item/GDZPPN001176498/