@article{10_14708_ma_v10i20_1458,
     author = {Zbigniew Leyk},
     title = {Superconvergence in the finite element method},
     journal = {Mathematica Applicanda},
     pages = { 93--107},
     publisher = {mathdoc},
     volume = {10},
     number = {20},
     year = {1982},
     doi = {10.14708/ma.v10i20.1458},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/ma.v10i20.1458/}
}