@article{MT_1996_31_a1,
     author = {M. Yu. Vasil'chik},
     title = {A conversible characteristic for the traces of functions in {Sobolev} spaces on the piecewise smooth boundary of a plane domain},
     journal = {Matemati\v{c}eskie trudy},
     pages = {40--57},
     publisher = {mathdoc},
     volume = {31},
     year = {1996},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1996_31_a1/}
}