@article{GDZPPN00117889X,
title = {Superconvergence Phenomenon in the Finite Element Method Arising from Averaging Gradients.},
journal = {Numerische Mathematik},
volume = {44},
year = {1984},
pages = {105-116},
zbl = {0575.65104},
url = {http://dml.mathdoc.fr/item/GDZPPN00117889X}
}
Krizek, Michal; Neittaanmäki, Pekka. Superconvergence Phenomenon in the Finite Element Method Arising from Averaging Gradients.. Numerische Mathematik, Tome 44 (1984) pp. 105-116. http://gdmltest.u-ga.fr/item/GDZPPN00117889X/