@article{TM_2006_255_a5,
     author = {B. Bojarski},
     title = {Pointwise {Characterization} of {Sobolev} {Classes}},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {71--87},
     publisher = {mathdoc},
     volume = {255},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/TM_2006_255_a5/}
}