@article{GDZPPN001184423, title = {Superconvergence for rectangular mixed finite elements.}, journal = {Numerische Mathematik}, volume = {58}, year = {1990}, pages = {287-298}, zbl = {0691.65076}, url = {http://dml.mathdoc.fr/item/GDZPPN001184423} }
Durán, Ricardo. Superconvergence for rectangular mixed finite elements.. Numerische Mathematik, Tome 58 (1990) pp. 287-298. http://gdmltest.u-ga.fr/item/GDZPPN001184423/