@article{GDZPPN001183001,
title = {Asymptotic Expansions and L...-Error Estimates for Mixed Finite Element Methods for Second Order Elliptic Problems.},
journal = {Numerische Mathematik},
volume = {55},
year = {1987},
pages = {401-430},
zbl = {0676.65109},
url = {http://dml.mathdoc.fr/item/GDZPPN001183001}
}
Wang, Junping. Asymptotic Expansions and L...-Error Estimates for Mixed Finite Element Methods for Second Order Elliptic Problems.. Numerische Mathematik, Tome 55 (1987) pp. 401-430. http://gdmltest.u-ga.fr/item/GDZPPN001183001/