@article{10_1017_S0017089500032614,
     author = {Burenkov, Viktor and Schulze, Bert-Wolfgang and Tarkhanov, Nikolai N.},
     title = {Extension operators for {Sobolev} spaces commuting with a given transform},
     journal = {Glasgow mathematical journal},
     pages = {291--296},
     year = {1998},
     volume = {40},
     number = {2},
     doi = {10.1017/S0017089500032614},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500032614/}
}