@article{ETNA_2004__18__a11,
     author = {Brenner, Susanne C.},
     title = {Discrete {Sobolev} and {Poincar\'e} inequalities for piecewise polynomial functions},
     journal = {Electronic transactions on numerical analysis},
     pages = {42--48},
     publisher = {mathdoc},
     volume = {18},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2004__18__a11/}
}