@article{IVM_2002_10_a1,
     author = {S. K. Vodop'yanov and A. D.-O. Ukhlov},
     title = {Superposition operators in {Sobolev} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {11--33},
     publisher = {mathdoc},
     number = {10},
     year = {2002},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_2002_10_a1/}
}