@article{M2AN_2015__49_2_551_0,
     author = {Bartels, S\"oren},
     title = {Fast and accurate finite element approximation of wave maps into spheres},
     journal = {ESAIM: Mathematical Modelling and Numerical Analysis },
     pages = {551--558},
     publisher = {EDP-Sciences},
     volume = {49},
     number = {2},
     year = {2015},
     doi = {10.1051/m2an/2014044},
     mrnumber = {3342217},
     zbl = {1316.65085},
     language = {en},
     url = {http://www.numdam.org/articles/10.1051/m2an/2014044/}
}