@article{10_21136_MB_1999_126243,
     author = {Naumann, J. and Simader, C. G.},
     title = {A second look on definition and equivalent norms of {Sobolev} spaces},
     journal = {Mathematica Bohemica},
     pages = {315--328},
     publisher = {mathdoc},
     volume = {124},
     number = {2-3},
     year = {1999},
     doi = {10.21136/MB.1999.126243},
     mrnumber = {1780700},
     zbl = {0941.46019},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1999.126243/}
}