@article{NUMA_1984__45_132955,
     author = {Michal Krizek and Pekka Neittaanm\"aki},
     title = {Superconvergence {Phenomenon} in the {Finite} {Element} {Method} {Arising} from {Averaging} {Gradients.}},
     journal = {Numerische Mathematik},
     pages = {105--116},
     publisher = {mathdoc},
     volume = {45},
     year = {1984},
     zbl = {0575.65104},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1984__45_132955/}
}