@article{CML_2013__5_2_3_0,
     author = {Bousquet, Pierre and Ponce, Augusto C. and Van Schaftingen, Jean},
     title = {Density of smooth maps for fractional {Sobolev} spaces $W^{s, p}$ into $\ell $ simply connected manifolds when $s \ge 1$},
     journal = {Confluentes Mathematici},
     pages = {3--24},
     publisher = {Institut Camille Jordan},
     volume = {5},
     number = {2},
     year = {2013},
     doi = {10.5802/cml.5},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/cml.5/}
}