@article{CRMATH_2014__352_10_807_0,
     author = {H\"opker, Martin and B\"ohm, Michael},
     title = {A note on the existence of extension operators for {Sobolev} spaces on periodic domains},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {807--810},
     publisher = {Elsevier},
     volume = {352},
     number = {10},
     year = {2014},
     doi = {10.1016/j.crma.2014.09.002},
     language = {en},
     url = {http://www.numdam.org/articles/10.1016/j.crma.2014.09.002/}
}