@article{M2AN_2014__48_3_727_0,
     author = {Hiptmair, Ralf and Moiola, Andrea and Perugia, Ilaria and Schwab, Christoph},
     title = {Approximation by harmonic polynomials in star-shaped domains and exponential convergence of {Trefftz} $hp${-dGFEM}},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {727--752},
     publisher = {EDP-Sciences},
     volume = {48},
     number = {3},
     year = {2014},
     doi = {10.1051/m2an/2013137},
     zbl = {1295.31004},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/m2an/2013137/}
}